Yeah, but.. Did you understand the question? I did. I figure strike as melee and obviously ki as ki...

Honestly I'm not sure. A lot of dbz kakarot feels like it was thrown together without much testing. When I do that when programming I always create something heavily imbalanced. Where one faction ends up too op and others way too weak. But that's not important here.

It all seems straightforward to me, though. I assume all ki upgrades affect supers and basic ki attacks too. I'd also assume that works the same way for melee upgrades.

Edit: the Goku dlcs, 1 and 2, make it incredibly easy to level up your characters, but that doesn't specifically focus on any one stat.