If abe stays hanging around in all future games while all other heroes like munch are not around anymore then Abe is the main character. But Its kinda stupid to start speculating about that now since the quintoligy isnt complete yet so we won't know a thing about the on going story.
You can't know or Abe is or isn't the leading character in the quintoligy.
You can't know or munch and future heroes will keep their important part in the games.
And you can't know how the story is going to end since we still have three games to go (AE was conciderd a bonus game right?) before the quintoligy ends and within those three games the story might take an unexpected turn becouse OWI found it better fitting...
So, conclusion: We don't know for sure or Abe is the main character or not... we actualy don't know anything for sure concerning the quintoligy (unless your working at OWI
).
Ok, I made my statement... anyone care to take it apart?