and third, because that would drive me completely nuts. I guess number three is the most important reason.
And I don't think that there will be a Shield agent coming up with (maybe) Nick Fury, because it's said, that the wave 26 army builder wears a ridiculous custome. Must be a Hydra Soldier. So, that Hydra goon seems to be the villain, which means Sabertooth can't be included here. I think muderofcrows list is fine, at least I'm not sure about the to mutants...
Let's not forget the absolutely ridiculous costumes the AIM goons used to wear!