They were Marquette but better last season (won regular season B1G by 3 games and then conference tournament, played better than Marquette in non-conf). B1G is overrated, but they got 9 teams in the dance and Purdue won the conference by 3 full games.
And then they returned even more than Marquette (only dudes they lost were marginal bench pieces not anyone on OMax level) and got a better recruiting class and possibly an impact transfer (Purdue people are much higher on Jones than I am at this point, but I could be wrong).
And they return the most dominant college player in years (22 and 13 with 2 blocks per game on 60% shooting).