Lashlee was on the outs at Auburn (and of course the offensive credit was all going to Malzahn anyways). UConn was a paycheck, he left at the first opportunity, heading back south to a similar type of institution with a raise and a more compatible head coach. Not to mention, at that point in time, UConn was much more attractive, new coach, solid conference, and without the baggage of a two-year FBS losing streak.
In this environment no FBS coach with options is considering a jump to UConn. At best it's lateral, but the money, conference situation and frankly the talent level offers little-no upside for a coach already in a FBS school, unless they, like Lashlee, are on the outs and need a paycheck.
If you want promising/up and coming you're going to need to go down a level to find a coach who would find UConn as an opportunity, or a mid-major coordinator looking to add Head Coach to their resume (P5 coordinators are making similar money to what UConn offers and have a better spring-board for better head coaching opportunities and can/will be more selective). Beyond the talent deficit, the conference situation, the pay, and the constant turnover have made UConn one of the worst head-coaching jobs in FBS.