I haven't read into tie breakers, mainly because I'm lazy. But those 5-3 teams need different forms of help. If at least two of those four win, the four 5-3 are eliminated. Texas Tech and West Virginia play each other so the loser has no chance.
I'm betting all four of the 6-2 teams win. While Az State vs Arizona is a rivalry game in Tucson, I saw Zona yesterday against TCU. They didn't look very good at all. Colorado host 0-8 Okie Lite. BYU hosts Houston. Iowa State gets K-State at home in Farmageddon. That will be close but I'm picking the Clones.