Pikmin representation is not what it could be. I'd have loved to see it like this: Olimar uses exclusively Red, Yellow and Blue, while Louie has access to Whites and Purples at the cost of speed and maybe some other things (matching his lazy personality but referencing his first appearance in Pikmin 2). I would imagine both Olimar and Louie using the tether recovery, while Alph recovers with Flying Pikmin and has access to Rock Pikmin on top of the other standard types.
The one thing that pisses me off most is that there are no Rock Pikmin for Olimar to use. My favorite Pikmin type! Whyyyyyy??
This idea works, but Olimar using nothing but the standard three doesn't seem right, he does add to his team in the second game. If he did only have the standard three, and Louie were to use White and Purple (while Olimar only uses Red, Yellow and Blue) Pikmin, the cook should also be allowed to use Bulbmin. Then you'd have three for each. The issues are that Olimar's old recovery simply isn't good enough (Winged Pikmin almost feel necessary), and Louie would just end up being a better character if he could easily bring out Purple Pikmin (I could be wrong).
My ideal Olimar and Louie would be:
Six Pikmin on the stage at a time. Can be Red, Yellow, Blue, Purple, White, Bulbmin or Rock.
Recovery is the same as it currently is.
Different Final Smash for Olimar/Alph and Louie/Brittany.
Olimar is faster, Louie is stronger.
Or maybe, have a different Captain added as DLC when the next sequel comes out, and they can have the new Pikmin 4 Pikmin, as well as the Rock Pikmin!
Best case scenario is that Louie gets added, though. Most wanted Echo/semi-clone.