Don’t get too excited!! The MC will get all new stats not dependent on the MC’s old archetype. But I would anticipate the stats for the new archetypes would give you some across-the-board bumps anyway. Like for example,
I could see a Dr. Stench with stats like: Pow: 20 (because of armored hands), Zap: 50, Whoosh: 10, Thud: 40, Hmmm: 20 (based on simple tactical components) and Shhh: 40 (because of gas clouds) (This is just off the top of my head)(basically I’m saying that unless I give the MC some decent stat bumps, much much much more than they could accomplish by just “training” they would still die instantly when confronting villains like Monstrosity X who might have stats like: Pow: 90, Zap: 80 (fear ability), Whoosh: 20, Thud: 95, Hmmm: 20, Shhh: 20
And yes in the Speckverse, abilities are capped at 99 even though that may not totally jive with Mega Cat’s Zenith Scale, which is NOT the Gospel, BTW