I simply don't agree with any of your points here.
CATERS to is quite a unique word- he has said things akin to considering each one a completely new entry. I'm not sure what 'catering' to a sequel means, but if it means being able to adapt anything he desires from the previous entry and do away with what fans expect to create what he wants entirely, then there you go.
If you're not sure what catering to sequels means... perhaps you shouldn't have used that word. As far as Smash goes, yes, each one is a new entry, but as new an entry as they might be, it's clear they're built off an already established base with an already established roster in an existing series.
I think this is a rather foolish argument. 'No one is going to play it so it doesn't matter what he does?' You personally may feel that way, but certainly many people play it.
Yes they do, but it's not the selling point of the game. Not that they don't help move units, but the number of people who pick up the game for anything other than the characters and the multiplayer are few and far between. If the SSE had been a huge game-seller, you can bet that something like it would've returned.
Additionally, multiplayer IS changed a LOT each game- perhaps you should have a chat with the competitive community. The game is still a multiplayer king of the hill fighter, but the mechanics change immensely, moreso than most other fighting games.
The mechanics aren't exclusive to multiplayer, they are part of the game as a whole. Multiplayer itself changes to a very minor degree each time compared to the other modes, which have gone from a quick Adventure mode to a length story to being omitted as a whole, we've gotten party-style board games, classic that has gone from an arcade mode to some new weird thing with All-Star being the most consistent of the lot, and even the lineup of characters in that mode is presented differently every game.
Plus... you may feel that way personally about the mechanics, and you're right, they do change, but among the majority, people are going to notice the differences in the other modes over the changes in mechanics, where the most you'll hear from an average player is "it feels faster/slower" or "more/less floaty", but that's not going to change the game to any great extent for them.
I guess this is actually one point I can agree with. Yes, in a Nintendo All-Stars roster, he tends to bring back more Nintendo All-Stars each game, rather than scour for new ones, purely. That just seems logical.
It's not just the "All-Stars" he brings back, it's the majority of the roster, which includes many characters that would be a stretch to classify as "All-Stars", a fair amount of whom probably wouldn't be included now if they hadn't been in the past.
Actually, the fact that it is still a Nintendo game means that the likelihood is that more Smash 4 players have played Mario and Pokemon than Smash prior. Just about anyone who has played Smash has played both of those other series, but a large portion of those who have played the others have not played smash.
So supposing Smash comes after Mario and Pokemon, why would it not make sense to release veterans as DLC? The audience for Smash characters (veterans) would still be huge. If your argument is that more people would be familiar with Mario and Pokemon characters, that's also implying, by your ranking, that more people would be familiar with veterans than any series apart from those two. And the thing is, we already got seven Mario characters, including three that weren't in Brawl, and are already getting a Pokemon DLC character... so even though I agree those series rank at the top, the likelihood of them getting more has become a bit diminished, on the other hand they can keep pulling from the veteran bin as that spans many series and includes characters of high popularity and familiarity among Smash fans (aka a
large portion of SSB4's audience).
I'm not against newcomer DLC or anything, I hope and expect we'll get some, but I don't see what's wrong with a mix. Yeah, there's a different kind of excitement with newcomers, but the thing is is that people
want the specific veterans over most of the potential newcomers. It's not just people on the internet or people knowledgeable about Smash's depth that get attached to a character.