Well I did say "as a lead," and by that I meant, "leading their own film." That said, we also haven't gotten a taste of his personality, so I don't really equate him to a Batman type yet. Bucky as we knew him wasn't really Batman-esque at all, and in TWS, he just did cool stuff action-wise, but was basically a brainwashed automaton (I realize that's about to change). Black Panther is a rich, powerful genius, and unlike Tony Stark, is actually a serious dude with an aura of mystique. Definitely more Batman.