with the known Omega Mutants currently, who is the most powerful

[Glio]

is Franklin losing his powers?

Yes, every time he uses his powers, he has a little lees.

You're right, Mister M was quite impressive. Vulcan if he didn't go full crazy and with a bit more focus could have probably achieved high level feats since controlling all of energy means you control... Everything I guess

But Vulcan's powers seem more like "Super Bishop / Captain Marvel" than fine control of energy. At least that's the feeling I have.