When I say "Fusion", I strictly mean Fusion Dance. Earing fusion has no requirements, no base powerlevel matching, and thus no need for me to say that the final product will be weak.

I do not doubt that Earing Fusion would get you a stronger being. I do doubt that for Dance fusion. This is solely based on the fact that

1) You can stuff it up (and have fat/thin/weak shit) and
2) You need to lower your power to match.

So let's do this again DEX: Tell me how you think Fusion Dance works?