1) UNLV is terrible at sports. I can't see the PAC taking them even if they are a T1 research school.
2) Kansas to the B10 is possible. Bad football. Good Basketball. It's probably a wash. AAU.
3a) Yeah, BYU has a large fanbase and would have the largest stadium. 3b) Cincy had a good year in 2020 — they aren't nearly as important as your post seems to think they are. 3c) UCF has had a couple great/undefeated years.... but really have very little 'history' behind them (have been average for a couple years). Geography: UCF is as far as BYU is from everyone and Cincy is close to.... WVU.
6) Adding 6 G5s doesn't help the B12. It makes it AAC 2.0. They need to be strategic, but it's the B12. They're dumber than rocks.