User blog comment:Jamie/Amazing Spider-Man 3 and 4/@comment-1895174-20130618082758/@comment-1895174-20130619024943

Re:Xemnas - Doc Ock IS the original Sinister Six. A Sinister Six without him isn't an Avengers without Ant-Man or Wasp, it's an Avengers without Iron Man or Captain America. That didn't work out well last time.

Re:Wikan - That may always be the case, but these licensing agreements Marvel made have tended to expire after seven years of inactivity. If The Amazing Spider-Man 4 is the last Spider-Man film Sony makes, their rights to the character would revert back by 2025 (assuming they don't voluntarily hand them over). Whether or not that license means anything by then, that's a different matter entirely.