I don't know about Utah. Take away their recent football success (which is significant) and what is left?
ASU has twice the enrollment and twice the state population and a bigger market in PHX (still matters a little bit). Sleeping giant compared to Utah.
If you simply switched football coaches at ASU and Utah, would you do a 180 on which was a better add to Big12?
I think you could argue UConn is a better add for the Big12. You might not win the argument, but it's debatable anyway.
In any event, I don't think Big12 adds ASU and Utah as 15 & 16. I think if Oregon doesn't jump, it stops at Arizona and 14.