I didn't necessarily mean abilities more than I meant actual power. For instance, Fecto Elfilis is Elfilin's power (which should be the same 3-C, likely 2-C as Fecto Forgo) + Fecto Forgo's power (which is 3-C, likely 2-C) + Leongar (who is also 3-C, likely 2-C). I'm saying they add together, and since they're all comparable to the same AP value, the resulting Fecto Elfilis (as a combination of those 3 plus members of the Beast Pack) would essentially end up 3x stronger than any single one of them.
Compounding this is the fact that Kirby is able to defeat Leongar, then defeat Fecto Forgo and still fight Fecto Elfilis just fine. I know how much health Kirby has going into that fight is a Game Mechanics thing, but story-wise, the point is that Kirby can defeat those two foes who would be noticeably weaker than Fecto Elfilis and then fight Fecto Elfilis himself.
My draft of Chaos Elfilis has him 7x stronger than original 3-C, likely 2-C value due to what it is an amalgamation of: Morpho Knight, Soul Forgo (both of whom can fight and damage Kirby who had recently defeated Fecto Elfilis, who is 3x stronger than the original 3-C, likely 2-C value), Leongar, and other random members of the Beast Pack.
I thought this made sense, and I was actually gonna send you a message asking you about this but as it turned out, the Fecto Forgo profile already happened.