That could be taken a few ways.

If you spend time leaping with Gau, he's easily one of the best, if not the best, fighters of your party. If you don't bother training with him at the Veldt, he's basically a throwaway character.

Did you spend time learning rage moves? I've done some, but I never wanted to try for the complete rage list. Even with the emulator-like features of the SNES Classic, it's just too time consuming.

I stick around long enough to get a few of the high end ones then I'm back to doing the story.