"Feedback is the only real overpowered one out of the ones you listed."
Yeah, I know. I was more asking, "Which Alien would you WANT to be OverPowered and thus be part of the Powerhouse-Playlist?"
I want HeatBlast to be part of the Powerhouse-Playlist, because he's Ben's very first transformation, so I got a lot of nostalgic sentiment for him, and I'd rather he NOT be a pushover in combat as Ben's foes continue to escalate. And since he's Ben premier fire-guy, and it was once stated he could reach SUPERNOVA temperatures and stuff, I think it's reasonable to beef-up his power-levels to match those of MonKi and Atomix.
Same goes for ChromaStone. I mean, his DNA-source is basically the Jesus/Superman of Petropia, so it wouldn't make sense for him NOT to be insanely-powerful, right? Plus he's just such a cool transformation, in both appearance and abilities, I just think it would suit him very well.
JetRay might not be a "powerhouse" exactly, but he IS crazy-fast, as he can enter Hyperspace and travel across the Milky-Way Galaxy in mere minutes, which means that he scales to THE MILLENNIUM-FALCON! Also, his neuro-shock eye-beams destroyed the Hands of Armageddon in that Ultimate Alien episode, and the Hands were stated to be super-durable and that previous attempts to destroy them caused the Great Chicago Fire and other catastrophes, so there's that.