Originally Posted by cherokeesam
Of the ones you guys listed in just the past few posts: Skurge, Abomination, Crossbones, Radioactive Man, and Kurse would definitely fit the bill.
But you're jumping to several conclusions that just simply are not warranted: (a) Enchantress and Skurge are NOT even slightly rumored to be in Thor 2. Wish they were, but they ain't. (b) "Dr. Wu" shows no signs whatsoever of being Chen Lu, or becoming Radioactive Man. The only thing we can safely assume about Dr. Wu right now is that he performs surgery on (a compliant) Tony Stark in China, and it's a safe bet that the surgery involves Extremis. (c) Zemo hasn't been confirmed or even hinted at yet for CATWS. It's a plausible enough scenario for him to be the guy pulling Winter Soldier's strings, but at this point, we simply don't know.
So that leaves huge holes vacancies in a traditional MoE lineup that you described. Maybe someday; maybe even for Avengers 3. But, Roger Wardell prophecies notwithstanding, the MoE aren't going to be part of Avengers 2.
Well, the only clue so far as to the villain in any future Avengers films is Thanos. If we were so inclined to believe Thanos wouldnt be the primary villain (but rather a background villain) our minds might wander to exploring any other various options. Judging by the trailers and production news for phase one before any of them were released, would any of us have guessed Loki leads the Chitauri to attack Manhattan with the help of the cosmic cube? Nah. But it became more logical as clues were uncovered.