You can't say that BYU had any more mental lapses than Utah did, Utah didn't adjust (show up) for almost 3 qtrs in 2018. I personally don't think it was as much coaching as Utah's players saying enough is enough and then when BYU went deeper into the depth chart it was over. To my point in another post, player vs player is where BYU has the disadvantage, not something one or two players can make up for very easily.
Wilson didn't just throw balls up for grabs, he was either tripped, tipped, or WR was just beaten by CB. That isn't mental issues, that is Utah beating BYU.

Now, you want to talk snaps over heads, and trying to shuttle it out of the EZ, that is something else.