I'd be more for keeping it away from Team Rose and Dark, for sure, but I still disagree with allowing it in TA charts at all.
If I were to settle with anything, leave it out of Bosses in general, and everything else for Dark and Rose(including Extras). For Sonic's Extra, I'd also be iffy on it, but it would be very useful at times, but it isn't necessarily too game breaking. I really don't know what else to cover, other than keep it out of Bosses.