I haven't watched BYU play at all, but just looking at the stats and the roster, I don't understand why anyone is concerned by their interior play. Even with 3 blowouts, they only have 2 posts playing averaging more that 8 mpg, those are Eric Mika (FR, 6'10" 230#) and Nate Austin (JR, 6'11" 230#). Mike has scored some (12.5 ppg), but only averages 4 rebounds per game and 3.5 fouls in around 20 minutes - playing against poor competition. Austin hasn't scored much at any time in his career, but is averaging around 10 rpg while playing almost 30 minutes a game. He's averaging 3.5 fouls per game too. After that, they have some young big players, but they have barely played in blowouts, I wouldn't expect anything out of them. 6'10" skinny guys that aren't super athletic are the exact types of players who struggle against our posts. They are going to have run the floor, step out and guard the perimeter without fouling, and guard the Ejim/Niang multiple post moves without fouling.
The guards are what make BYU go, but I doubt they've seen anything like Kane, he should be able to post any of them up at any time. They could really struggle with the ISU's physical offense, if we attack the rim (and don't get called for charges every play).
It doesn't look to me like they have the kind of 6'6" physical athlete to match up with Kane, Hogue and Ejim.
I am afraid of a tight whistle in this game though, that could really take our edge away.