Lot of options, interested to see the result. FYI this is not some sort of poll to act like it's not Lavin's fault (option 4 definitely is, and option 3 kind of implies that it was Dunlap, not Lavin, that had us play so well in year 1, actually).
Personally I think it's Dunlap's departure. He seems like an all business guy that cares so much about winning, and was obviously huge to the 2011 team playing well and player development. If he was still with the staff another 1 or 2 years I think 1) the staff would never have taken it easy on the recruiting trail (not that dunlap would have been signing big time recruits, but that his presence would never have allowed a relaxed year), and 2) our guys would have improved quicker and team would have played better, so we prob make the tourney last year.