Thank god.
But he's still wrong - Facey is what, four or five inches taller?
Kentan was 6'9 or 10, which would put him 2-3 inches taller than Polley, and 1-3 inches taller than Larrier/Mucius. Mucius is probably the better rebounder of the two, as Polley has struggled to rebound against good competition. Polley is a better 3 point shooter.
Polley fits the idea of a stretch 4 but really needs to strengthen up to improve his rebounding. Mucius' athleticism will allow him to play the 3, and he has a good midrange jumper. He needs to extend his range to the 3 point line, though.
The two could easily coexist on the floor and at that point, the defensive assignment would figure itself out in due time. So like you've alluded to, it's kind of a waste of time theorizing who would play where.
I think most of us agree Larrier will play a lot of 4 this year even if Mucius commits and reclassifies.