Thor, Hulk, & Ultron would probably make up 3/4 of the remaining Marvel characters (unless Ultron is only a boss), & I can't imagine that there would be only one playable GotG character given their popularity. And with Chun-Li being a given on the Capcom side (& assuming Sigma isn't only a boss), that doesn't leave the Capcom side with very many options. Hell, I could easily see it being Asura, Chun-Li, Wesker, & Sigma.
It's gonna need more diversity. If that's let's just say the final roster. There's a whole 4 female caharcters
Either way you slice it, if this is accurate, there's only really room for one or two more females. And with Guardians likely getting a 2nd rep, that knocks the count down to 1 (unless Gamora is the 2nd GotG rep).