I've been thinking about this issue for quite some time. Starfire is 100 tonner, with a bit of Energy Projection sprinkled into her which makes her a threat of the level of a Kryptonian (Battle Users, don't get on my ass pwease). So its pretty safe to say that she's one of the more powerful superheroes in the the Superhero within the DC Universe, which leaves the question, why is she on a low-end street level team?
I mean, obviously there's a lot of chemistry in the book, I'm not even trying to imply that she shouldn't be on the team because I'm enjoying the three characters that Lobdell has put on the book. But lets face it, anything that'll provide any sort of a realistic challenge to Todd and Jason will pretty much be a cakewalk for Starfire. Lobdell obviously is a very good writer and I have enough confidence on his work that he'd be able to allow the team to work as it is, but I honestly don't know if it'll work with any other writer, if the book ends up changing creative teams.
Lobdell has hinted at the fact that he may be depowering Kory, because even though she's shown to still be able to use her powers, it seems to me that its quite possible for Starfire to have become less powerful than she was previously. (Not to mention that otherwise it seems that that whole bit of plot was kind of irrelevant and unnecessary).
While I obviously don't think she should be totally depowered, I'm interested to see what could be done with her if she was a 25 tonner instead, since it would obviously allow for a greater range of stories and more variety in the book.