I posted about this in another thread. ISU just doesn't pressure the defense much, and doesn't shoot many FTs. When they do shoot them, they don't shoot them well (worst FT% last year in conference games, and worst FT% in conference games so far this year). Last night, if ISU could have just shot FTs at 60% , they win the game.
In 4 of the road conference road games so far, ISU's opponent has had a +10 or more advantage in FTAs, and in three games the advantage was closer to 20 (TCU +19, OSU +16, TT +16). Thankfully, TCU shot terribly from the FT line, or that would have been a loss for ISU. The staff needs to do something to correct this. The Big 12 is not a place for passive offensive.
On the defense side, constantly switching and helping on defense creates favorable offensive mismatches and open shooters when teams have similar athletic ability, and ISU often ends up fouling when the opponent exploits those mismatches.