TDLink
Member
I was surprised in the first place that Zola had such a big role in the first film. If not Cap 2, he will definitely return for Cap 3. I think it just depends on whether or not Red Skull will be back for the first sequel or not. We don't know yet if Winter Soldier is the only adversary in the film or if he just has a major role and the real villain will be someone like Zemo or Skull. (Please be Zemo)
Zemo is in the movie so I have a feeling he will in fact be the "main" antagonist.