My (total random fan) guesses are
- He had 3-5 people instead of 10-12. Or, a number of the people on the list weren't actually good candidates, and he needed time to recruit better candidates; so he had 3-5 good candidates, and another 5 that were "weak, but will accept".
- He was still working on his list and got caught off guard when CPJ retired 1 year earlier than expected
- Some of the better candidates for continuity were either air raid or flexbone, and even air raid was off the table as a scheme offense. (again, I'm guessing)
- Whisenhunt was the first choice and set up, and both he and Stansbury were taken aback by the (un)popular outcry.
- Other coaches like Satterfield chose other options with better funded AAs and less transition work. Also, Satterfield pulled all the scholarship offers at Louisville his first season--Stansbury may have put constraints on the transition that prospective coaches weren't willing to accept.
Louisville is widely perceived as coming open this year, or next at the latest. Nebraska is probably also coming open this season. Both have AAs flush with cash. I think he'll be at one of those.
I think he'll have a better option than Vandy. There will be B1G jobs open. Vandy is hard to recruit to. The cash is good, but who wants to go years between bowl games, and for the bowl games to be awful?