JMHO, but this is a horrible move by Ark. It appears to be an attempt to "keep the current staff in place" yet do it with a guy that is not an interim coach. J. L. Smith was on the staff 2009-2011, and I guess they feel he'll keep things rolling right along. This is the Ark. version of the Nallsminger experiment, but with the HC instead of the OC.
Ark. wasn't looking to divorce Petrino, but they wound up that way. In a divorce it's simply best to move on, and make wholesale change even if you didn't want the divorce to start with.