It's just as much about Rosario as it is about Adam, Wilson, Jesse, et al - I mean, Mimi is the love interest. You need her just as much as you need Roger. Actually, while RENT *is* an ensemble piece, Roger, Mark and Mimi are probably best considered the "leads." Rosario is their biggest star, and because this is a pretty big-budget movie, they're *going* to use her name, but nothing about the material is going to change. Mimi's character isn't suddenly going to get bigger because someone more famous is playing her than is playing Roger. They may even try to bank on the fact that they have part of the OBC, because, like Marquise said, that is so rare. It'll be a happy day when I see Adam or Anthony's name in huge letters on a poster.
A work of art is an invitation to love.