Certainly very possible! Though if my chronology is accurate, Dunn was promoted to AHC only 3 days prior to Miss St.'s publicly announced departure of its RB coach to Saban's staff. You know things were going on behind the scenes before then. It seems like plenty of time for Saban to have inquired about, negotiated and signed the MS RB coach. Moorhead was probably on the phone with RE the minute he hung up with Saban ...lol The time line would fit with RE's promotion of Dunn.
The other scenario would suggest that TR was ready to leave because RE took the AHC title away from him. Though timing-wise, everything would seem to have come together in a very conveniently short time for him considering he landed an SEC caliber coaching position with a former coaching buddy of his to boot. Who knows for sure, but TR did a great job for us while here....wish him all the best in his new position!