Subtervotion
Member
If they wanted to address a couple of Olimar's weaknesses in Brawl, they could work them into a couple of his special moves. Maybe replace the Pikmin chain with Flying Pikmin, and change the Pikmin call into something more useful like a Rock Pikmin counter, and buff the attacking Pikmin to compensate for not being able to call them back after a toss.
The only concern would be that baking them into the moveset kind of goes against the design of the character, but there are options to work them in, if they want to. Pikmin 3's been in development long enough that they've probably been able to consider it since before Smash 4 started development.
Flying pikmin should be his B up. I'd love Olimar to be good so I can use him.