I assume Carr is staying back so he can have an easier match or two to get back in shape and prep for big 12's. Otherwise, he doesn't benefit.
From my calcs, Degen is 9-4, so wrestling against Mizzou and NDSt would get him to 15. This would qualify him for RPI and he is already high enough in coaches rank which would gain him an allocation. I assume Degen is staying back to preserve and improve upon his winning percentage and have some easier matches? If he went to Mizzou and beat Mauller, it would improve his NCAA seed. Probably a tough decision.
I believe Colbray and Coleman each need 5 more matches before Big12's to be eligible for RPI. Colbray could qualify for an allocation if he doesn't wrestle at all since he has a .700 win% and ranked high enough. However, if he wrestles, he will have to go at least 3-1 to maintain his win%. 5 more matches and he'd qualify for RPI. However, right now he projects around a 30 RPI and I don't see that improving with the remaining competition. Going to Mizzou and losing to Flynn would have been detrimental to his allocation. Best bet for allocation is to wrestle tournament and ND State and go 5-0! Otherwise, he could just wrestle (and win) a couple matches at the tournament and not wrestle against ND State, which would preserve his winning%.
Coleman's only chance to qualify is to get his 5 more matches through tourney and ND State. He is currently ranked 25 and RPI projected at mid-20's. Hopefully, he wins the rest of his matches and the competiton doesn't lower his RPI or coaches rank!