But yes, here's the point I was trying to make.
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You can see how the Star Fox characters in Brawl sort of use Command as the basis for their designs, but at the same time Sakurai took a lot of creative liberties as well, mixing in a few elements from their other appearances. It's not just their Command designs ported wholesale.
And when you look at Fox and Falco's Ultimate designs, you can see they're not 100% Zero. They're really just their old Brawl/Command selfs, just wearing their clothing from Zero (just compare Falco's beak designs to see my point). Then you have Wolf, who, outside of his head, has a completely original and different design from what he looked like in Zero.
So the point is, if Krystal were playable, she'd probably be given similar treatment, with a mostly new design that just takes elements from her game appearances. Kinda like what Smashified made.