I never post in this thread, but I've gotta mention that base game Mii costumes and DLC Mii costumes are two different beasts. The fact that you have to pay for them gives a different perspective on whether or not they're meant as consolation prizes again. Granted, it could still just be easy porting from the Wii U version for a quick, tiny cash grab with no impact on character chances (given Rex, Isaac, etc. were all brand-new costumes from ground-up), and given Square's practices of milking money dry from DLC, it's not too farfetched to think they'd release the Mii outfit again and then Geno himself down the line. If they have the choice, they'll go with both to milk him for all he's worth.
Of course, this is all speculation, but the point is that paid versus free in base game could easily change the climate. In what way, however, we can't be sure.