Could be that Wyatt didn't have his heart in it as he was never really considered for the OC position even though he was held over from the previous staff. Could be that he's upset that he wasn't taken to UT with the rest. Could be that he was sending resumes out to find another job (see @coachv's comment about going for the UA job and he was also linked with the Lamar head job) and Applewhite has stressed he wants coaches that want to be here. Could be that he wasn't happy with the spring performance of the receivers or our recruiting efforts. Could be that he just didn't mesh with our new OC. Whatever happened, Wyatt just found out in the last 3 days because he just tweeted out that he was ready to hit the road and begin recruiting.
With Guiton, they get a young guy that's looking to prove himself and was well respected as a GA in the locker room so he'll fit easily back into the locker room while also knowing the chain of command. Guiton was doing some recruiting for us prior to the bowl game so they probably were impressed with him in that area as well.