Geno's Mii would of came back with Hero.
Sugiuyama, Horii, nor Armor Project would have nothing to do with that.
SquareEnix is one company, many people forget this when it comes to discussion, there is no reason to split the Mii's up, and if this is really because "They wanted it to be only Dragon Quest", they would of played the Dragon Quest music during the Mii Presentation.
Also, they would have no reason to do that, there would be no point in stressing out the team so much to delay Mii costumes for no reason.
Also also, Joker, which is owned by Atlus, which is owned by Sega, still got the old Sonic Mii's.
And Hero, oddly enough only has 4 Mii Costumes when, they only have 2 left, adding those back would make 6, the perfect amount.
They wouldn't allow a request to stop Mii costumes and wait over a year to add it back when they could of, easily, added it back any time.
Also, the overwhelming amount of evidence pointing to another Square rep is, really, amazing.
Also also, Geno's Mii being missing on any fronts, then having Mallow and Smithy Miis leak, showed a sign that, when FP2 was greenlit, they went with Geno to be the rep.
Either way, it's a good situation.