Zeyphersan
Banned
uh, which part? :lol
1. Whedon's contract with Marvel runs to 2015, so it expires this year.
2. He was approached to write Infinity War but turned it down.
3. He's mentioned on this press tour, in one of the hundreds of same-y interviews, that he can't imagine not still meeting with Marvel, but in more of a pitch session over lunch thing, which sounds like a far cry from creative consultant and ghost co-writer.
(Personally, I don't think it even makes sense for Whedon to be in that role anyway if the Russos and their screenwriting pair are handling Civil War and Infinity War; if anyone is shaping the overall direction of Phase 3, it'd be them)
And I could be wrong, but the only thing I ever saw of Favreau having a hand in The Avengers is when he wrote a tweet about the first day of filming starting.
It's pretty common for an EP credit to just be largely ceremonial. Stan Lee is an executive producer on all Marvel stuff, for example