KU has lost league home games several times during the streak -- OSU, ISU twice, K-State, A&M, and Texas have all won there. They have never lost more than one league home game, though, and that obviously gives them a huge advantage. If someone else can knock them off in Allen, it would make things much more interesting.
As far as whether this is the "worst team" Self has had during the streak -- I think it is too early to say that. They have had bad stretches before. Five years ago, they lost 3 straight conference games -- home to OSU, at TCU against the worst team the league has ever had, and at Norman. And go back and look at their 2012 team that made it all the way to the national championship game -- not exactly a loaded roster. This is definitely a different type of team, and will be unless/until they get one of their guys eligible. But it seems like every time people count them out, they do what they need to do to keep the streak alive. I think Saturday's game will be huge -- if TCU can knock them off, it would likely put them in a two-game hole. But if they win there, they will be right back on track. In other words, GO FROGS!