Since I find the "obvious choice" logic to be as much bs now as it was back then, I theorize that there was a mix of both outdated legitimate info and disinformation.
Warning to those who just go "tl;dr" and complain over long posts, that will only show me you are too
lazy and didn't read it. You have no right to say anything on the matter as a result.
Lets go over the facts for each leak:
1st Segment
The following characters were to be revealed at E3 2013:
-"Animal Crossing Guy"
-Mega Man
-Wii Fit Trainer
-Little Mac
-Miis
-Pac-Man
Literally half of the listed characters ended up being revealed at E3 2013. One of which was someone Sakurai
directly expressed against being playable in the past (Villager), and one that no one in their right mind would have given any serious thought to (Wii Fit Trainer).
The other three were later revealed at different times (with two ironically being revealed at E3
2014). He was right about the characters, but wrong on when they'd be revealed.
2nd Segment
-Miis and Pac-Man are still yet to be revealed, but are in fact in the game. (Little Mac had already been revealed)
-The following characters are also in the game:
-Shulk
-Palutena
-Chrom
-Chorus Men
-"Pokémon from X/Y"
Every one of the listed characters except two were accurate. It was also later confirmed by Sakurai that before Greninja was ultimately decided upon, there was essentially a placeholder "slot" for an X/Y Pokémon that would be filled out on a later date.
This leads to the theory of the informant's information being from early plans for the roster, before Greninja was chosen to fill out the slot.
Chrom was later revealed to
not be playable, with Robin taking his place (though Chrom would be a part of Robin's Final Smash). While the outdated info theory would imply that Chrom was initially planned on, but was ousted in favor of Robin.
Sakurai did later discuss that Chrom
was in fact considered to fill the placeholder "slot" for a character from Fire Emblem Awakening but was deemed uninteresting in contrast to Robin. However, with Sakurai's wording, it doesn't seem Chrom was ever
planned, only considered. Which would leave doubt that Chrom would be listed among the roster plans the informant would have seen as opposed to another placeholder like with the X/Y Pokémon.
A feasible explanation (whether or not it's accurate cannot be verified) is that the informant
did see the placeholder and make a reasonable assumption that it would refer to Chrom (unlike the Pokémon placeholder, which wouldn't really bring
any specific Pokémon to mind as the obvious choice). Or Sakurai
did in fact initially plan on Chrom before going with Robin instead.
The Chorus Men (known outside Japan as the Chorus
Kids) are the bigger anomaly. Much like when they were initially brought up by the informant, they are entirely left-field in this. There is nothing that can be used as evidence that they were even
considered, as Sakurai has not mentioned them at all nor is there any accessible data within the games themselves that shows a sign that they were to be a part of them other a simple trophy on the 3DS.
Unlike Chrom, there is no possible case of replacement, as there isn't another Rhythm Heaven character being playable instead. In fact, outside of a few trophies distributed between the two games, the
only content from Rhythm Heaven is a rare enemy in Smash Run for the 3DS. Some assume that this
is evidence for them when combined with the fact the Ice Climbers were planned to return but were cut due to their duo gimmick not working on the 3DS as the Chorus Men hypothetically could've
also been cut for a similar reasoning since they are a trio and Ice Climber also has an enemy in Smash Run. This isn't good enough evidence, but that's straying into another subject entirely.
If we end up finding evidence later that the Chorus Men
were indeed another case like the Ice Climbers, then the outdated info logic applies. If not, then they could have very well have been a case of disinformation. Without delving too deep in the history of the X/Y leak from PokéBeach, I'll summarize it as a series of time-lapsed leaks that were almost completely true, with a few honest mistakes including:
-minor misspellings of Pokémon names (with said Pokémon being completely unknown to the public or English names of recently revealed Pokémon in CoroCoro being unknown)
-claiming Mewtwo's unrevealed version exclusive form (note: this was before Mega Evolutions were even revealed) resembled Mew more than the revealed one
-claiming your "friendly rival" gave you the
final form of the starter disadvantaged to yours instead of the basic form
-swapped the secondary types of Chespin's and Froakie's then-unrevealed final forms (though this may have been disinformation as well)
-claimed Psychic resisted Fairy attacks (note: this was before Fairy type was even
announced) instead of Poison
etc. There was one mistake that cannot be excused, however. The leak claimed that there were
two Professors in the Kalos region, Sycamore (who gave you the Kanto starters; also unknown at the time) and Patrice (who gave you the Kalos starters). Sycamore is the only Professor in Kalos, and your Kalos starter is given to you by Trevor, who is not even
close to being a Professor. This was disinformation.
Typically, leakers will throw in some disinformation within their legitimate information as an attempt to avoid detection by the companies. With this in mind, the Chorus Men could very well be the "Professor Patrice" of the Gematsu leak.
3rd Segment
-E3 2014 would be the final E3 prior to Smash's release date.
-Reaffirmation of the previously mentioning characters, with Miis notably going under the identity of
Mii Fighters for the first time.
-There was internal debate on deciding which of the two Mother boys would stay. Odds were not in Lucas' favor.
-There is going to be post-release character DLC.
Honestly not much for evaluation, since it was a no-brainer that E3 2014 would be the last E3 before release, considering for it to
not have been, Smash would need to have been delayed until after June of 2015, also, the characters are the same as before and there is no way to verify whether or not the claim about there being a direct debate on Ness vs. Lucas is accurate at this point.
That being said, the end result of Lucas' potential fate ended up being true (which could be entirely coincidence), Mii Fighters being the "official" collective title for the Miis was true (though Palutena isn't referred to as "Goddess Palutena" as she was listed in this one, a rather minor discrepancy), and Mewtwo proved that post-release DLC characters do exist (even if it's just Mewtwo at this time). The informant also personally found the concept to be rather greedy, which could theoretically relate to Mewtwo being used as incentive to purchase both games, though that's breaking off too much into speculation.
4th Segment
-"Enjoy my good friend Shulk!"
-"I only know what has been done, not what or when they will be made available. Sakurai may change his mind, and he does all the time. Shulk will not be changed."
If it weren't for Chrom being disconfirmed in the very trailer that
wasn't Shulk's like everyone speculated even before this e-mail by the leaker, then the mistake could have been seen as another E3 2013 case where the informant got the reveal date wrong.
In fact....an e-mail the informant gave to Sal Romano the morning before Robin's trailer, he kind of
backpedaled a bit with the second quote.
On more than just Shulk's reveal.
Actually reading the wording over and over, it seems to me that the informant learned that Shulk
would not be revealed that day, and that information he gave is no longer accurate (as in he learned of who
was to be revealed), though Shulk being in the game is still true.
Just some food for thought. It's taken me about 3 hours to type this all out, so I expect to be taken seriously, even if you're deadest on Gematsu on being
nothing but a complete sham.