Sugar coat as you like. ANd you are right----no one remembers a 6 seed losing. But they do remember:
2005: KU losing to 14 seed Bucknell as a 3(1st round)
2006: KU losing to 12 seed Bradley as a 4.(1st round)
2010: 1 seed KU losing to 9 seeded No. Iowa(2nd round)
2013: I seed KU blowing a huge lead vs 4 seed UM in SW 16
2014: 2nd seed KU losing to 10 seed Stanford(2nd round)
2015: 2 seed KU losing to 7 seeded WSU in 2nd round.
Four times this decade KU has failed to get past the 2nd round as a 1 or 2 seed. And that's not even counting the choke jobs under Williams. The 97 and 98 teams come to mind. 1997 KU was 34-2. Lost in the SW 16. 1998, 35-4, lost in second round. 1990 lost in second round as a 2 seed.
Probably a few more. I mean hey, It's what KU does.....
Note: Noting against my fellow KU fans on here. Especially my man Preston. But hey---it is what it is.