That actually would be pretty interesting. But at the same time, I would like for Cap to have an enemy that isn't too easy for him to justify himself. Skull as the villain makes it too easy for him to reassure himself that he's doing the right thing. But a man who seems to truly want what he thinks is best, and may actually have solid points...that's harder, and not something we've seen Cap up against. Now, what would be REALLY scary would be if we see that Skull has actually evolved into that kind of person. Who, while still wanting power, actually does have good points about what he thinks would be best for the world. Also, I didn't put this in spoiler tags since it's just speculation, but if you want me to I can definitely do that.