I think it’s safe to say Kansas absolutely would not have won the ACC in 2005, 2009 and 2015. I can’t recall how strong the ACC was in 2006 but that was a season where Kansas didn’t have an elite team so it’s likely that they wouldn’t have won the ACC that year. We can probably include 2014 in there as well. Most of the other years KU had an elite team so they would’ve been right there in the mix with anybody.
The consistency is really remarkable. Here's a comparison of KU verse the top-ranked ACC team before the Tournament. ACC has a 8-6 edge, but certainly a lot of those years would have come down to the wire.
2018
1. Virginia
4. Kansas
2017
3. Kansas
6. North Carolina
2016
1. Kansas
3. North Carolina
2015
4. Duke
10. Kansas
2014
3. Virginia
10. Kansas
2013
3. Kansas
5. Miami
2012
4. North Carolina
6. Kansas
2011
2. Kansas
3. Duke
2010
1. Kansas
3. Duke
2009
2. North Carolina
14. Kansas
2008
1. North Carolina
4. Kansas
2007
2. Kansas
4. North Carolina
2006
1. Duke
12. Kansas
2005
2. North Carolina
12. Kansas