In 2015, an IN team that went 9-9 in conference went to the dance but a 9-9 IL did not. They won their 10th game in the BTT beating us and lost the next round. IL lost their 1st round game In 2014, with only 12 teams, a 9-9 Iowa went to the dance. They never had the tenth win as they lost to us in BTT. In 2013, a 9-9 IA did not go even with a 10th win in BTT but an 8-10 IL (9th win in BTT) and and 8-10 MN with no BTT win went to the dance. In 2012 no 9-9 teamsbut every one with 10-8 or above went and 8-10 teams all went to NIT. In 2011, four 9-9 teams all went. In 2010, one 10-8 team did not go (NIT for IL) but a 9-9 MN went.
So in general, a 10-8 team not going is the exception as in the tim looked at all but one went. And most 9-9 teams and even some 8-10 teams went. So generally the BIG is seen as strong enough and 10 wins is enough. Exceptions? A couple but they are exceptions.