Playing devil's advocate.
MOST of our stars/entertainers were "groomed" before they began. So that stage presence we see today wasn't always there. Whoever wins will be groomed as well.
Former AIers last night: That chick Tamyra did well with her rendition of Somewhere Over the Rainbow. Did they re-arrange the verses or something?

Justin: ummmmm, he's aight! He kind of irks me. Is his middle name Guiarini (sp?) or what?
IMO, with AI and other shows like it, as long as you have the exposure and it's HIS will for you to shine, you will.
I'm sure K.Lo will do well, just like Frenchie and Tamyra have.
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