A few things:
1 Playing CB in a three is a lot different to playing it in a two.
2 It's Ramadan and none of us know what condition Diakite is in.
3 Price played right back but Mowbray wanted to protect him (not being a natural right back) by focusing on the offensive side. This is part of the reason Molumby played on the right side of midfield (it wasn't right wing as I keep seeing people say) to offer defensive cover to Price.
1. Sorry, should have been more explicit. I meant playing Holgate at RB instead of Price and having a four of Holgate Diakite, Bartley and Heggem
2. Other players of Muslim faith seem to manage. Isn't there a specific break in play to accommodate this?
3. Wouldn't need to protect Price at RB if he hadn't been selected there (see 1)