If you can’t make him the lead, you can’t make The Lion King work either.
We’re assuming that Dumbo will be a Jungle Book-esque CGI animal, but that’s ok.
If they were being cast to do the voices of animal characters that would be one thing, but as far as we can tell they’re being cast to play other humans.
All of the recent news surrounding Tim Burton’s Dumbo project has been around casting, specifically, around the casting of some pretty big name stars like Tom Hanks and Will Smith (who didn’t pan out).