So why is everyone so sure Andrew and Toby spiderman are going to be in this movie?

With all the constant leaks and rumors and never knowing what quite to believe, it's nice to know that we are at least receiving doc oc, green goblin, and more in one form or another. But people are so positive at this point that Andrew Garfield and Tobey Maguire are in this movie, and I never knew why. What got leaked? Is this just a fan theory gone rampant? Is there something to back this up, aside from the fact that the movie is bringing in old villains from their movies?

At this point, from a certain point of view, it seems inevitable that they'll show up. With this trailer alone confirming that it's a mad multiverse scenario, it seems like it's confirming all the rumors, or at least, that's what it represents to people. But riddle me this: why couldn't it just be a movie where villains pour in from alternate dimensions and timelines to mess up peter, no other spidermen at all? Had there been no leaks and no rumors, this would be an amazing idea on its own, with no need for the older spidermen to be in it. I fear that people have set themselves up for failure by expecting that they'll be in it for certain, when what we definitively know about this movie looks amazing anyways.

But either way, I am genuinely curious to know any harder evidence people have on them being in this film. So lay it on me.