Yea, the Illini are a puzzling team. They have some weird losses on their schedule, like losing @ Penn State, and Maryland at home. They also barely got by OSU in the Big 10 tournament. They were down to Nebraska and Wisconsin by double digits in both of their other tournament games before pulling away late.
I do see some similarities to that ISU team, where they had some weird losses, and ISU barely squeaked by Texas in the Big 12 tournament. Illinois seems a little stronger than that team, but it all depends on which team shows up, or if their opponent gets up and just doesn't let them back like everyone else has.
I wouldn't be shocked to see BYU take them out, that feels like a 50/50 game.