So I think if you are going to compare bodies than compare freshman Gabby to Mir not senior Gabby.. I think she will end being used similarly to Jamelle, Willnet Crockett, Kalena Green, Kelly Faris a bit and Gabby. Geno has his patterns un recruiting. If Geno had size in the Gabby years, I bet she would have played closer to her present WNBA role but he needed her to compensate for a team with no size.
I agree completely that if Geno had more size at the time, Gabby might have been used differently, but he did manage to fit a square peg in a round hole pretty effectively, finding ways to still make her effective offensively from the foul line.
She was largely a passer from there, but close enough to take a wide open 15 footer if they gave it to her, and quick enough to blow by a big that guarded her close for a layup. Gabby could do everything else, but Geno found a way to make her a very effective scorer as well in their offense.
Mir and the others that may not initially be in the prime time rotation, will certainly have limited minutes in the conference blowouts to learn and show how they might be able to contribute and fit in with the others. They also might become specialists. Mir could represent a completely different skill-set to Anna at SF for example. Anna is a very skilled shooter/passer, but maybe Mir could bring more defense and rebounding when needed etc.
If Mir and Piath were on last years team I suspect they would have gotten rotation minutes in lieu of Kyla and Molly. We only had Aubrey as a quality sub. This year it at least appears we can have three very very good players off the bench at a minimum. Mir and Piath might expand that, but with those first 8 Geno could pretty much cover all the minutes in contested games if he wants, without having to put a weak link on the floor.
Being an above average 9th or 10th best player, doesn't mean you necessarily get significant minutes. The question might be why Mir or Piath instead of Nika, Aaliyah, Aubrey, Anna or Evina. Those are probably going to be hard players to take minutes away from, unless Geno decides on some specialist substitutions or to pick up the pace and press and fast break for much of the game. Of course one injury opens the door, as could foul trouble in some games..