Your assumption on what the person leaking should or shouldn't know, which is seriously BS.
You are not privy to what details anyone should, shouldn't, should be told, or would be told. You know nothing. You have just as much information as the rest of us, that this leak has succeeded in being 100% on all the newcomers it leaked, without misfires.
Yeah, but what else do we have to go on besides that? It's the process of elimination, man. It's a natural progression. Besides, he's NOT been 100% on all the newcomers leaked because Greninja. Spin it however way you want to, rationalize it however you want to that helps you sleep at night, but the evidence points to them knowing who Greninja was, what Greninja does and what they wanted to do with him from the moment they decided to put him on the roster way back in 2012. The leaker, if he had access to the ENTIRE ROSTER, wouldn't have missed Rosalina and Greninja.
And if he hadn't, we'd not be sitting here arguing about it as long as we have. Yet, he didn't accurately predict those, so, process of elimination:
* Leaker has been 100% accurate on all declared E3 newcomers so far. Missing a few, but great evidence in favor of the leak.
* Leaker has been 0% accurate on all non-E3 newcomers so far.
Isn't the first thing that comes to mind is 'This guy has access to information, but it's all information pertaining to E3.'? That should be the first rational thought that crosses through anyone's mind looking at that information. So, who has access to information at E3 before it actually drops at E3?
Public Relations and Marketing. Development Team (Sakurai, Bamco). Top Echelon Management (Iwata, Reggie).
We can probably rule out that anyone in the development team did it because the work culture over in Japan is CONSIDERABLY different than over here in America. No-one over there would likely leak things because it undermines all the work of their co-workers, and the efforts to keep it secret.
We can rule out it's Iwata, Reggie and Sakurai, because the former two are professionals and tight-lipped, they won't actually say anything about Smash, they've got more important things to worry about anyway, unless they're told to talk about it.
So all we have left is PR/Marketing, who would feasibly be who Nintendo goes to to prepare the stuff for E3 because, well, it's both Public Relations (it's the biggest video game expo in America, and there's tons of THE PUBLIC there), and they're trying to sell the product to the public, so that's marketing. They likely have pretty much unobstructed access to all of this media from Smash Brothers because it needs organizing, translating, editing and preparing.
We also can't really rule out people from E3 sneaking peeks of this information, either, 'cause the information we've gotten came hours before Smash presentations. They'd naturally have their hands on all the Smash Brothers media.
So, yeah, you're not privy to any of the details, either, but I'm looking at it logically. This is what I've come up with the evidence. The mention of Greninja's cemented place on the roster in the earliest months of Smash by Sakurai just was the last nail in the coffin. The guy doesn't have access to roster information. He has access to information that comes through him, and all of that happens to be E3 information. That's not a coincidence.
Why he revealed 'Pokemon from X and Y' when the information should have been clearly there is anyone's guess. Maybe hearsay. I'm sorry that it upsets you that we've flung the curtain aside to reveal the Gematsu Leaker isn't the premiere roster authority everyone expected him to be, just really a guy behind the scenes pulling strings and leaving out information he never had to begin with.
