ISU is not better than Duke against common competition, but they're a tough matchup for us. Duke generally does not defend teams that (i) have athletic guards who can get into the lane; and (ii) a number of 3 pt. shooters on the perimeter and wing who can stretch our D. Teams that have both are particularly problematic. The 4 losses we've suffered to date have come against squads that can do both. However, beyond those examples we're very familiar with, let's also not forgot how well even teams have shot against us from 3 (including very mediocre shooting teams) in games we actually won. Va Tech hit 12 3s. Ga Tech (a terrible shooting team) went 8 of 11. UNC, a poor shooting squad, went 8 of 16. FSU, a poor shooting squad, went 7 of 14.
When you combine ISU's athleticism on the perimeter with their 3 pt. shooting / our alarming inability to defend the 3 at times, you see a pretty obvious matchup issue. If we zone ISU, they'll absolutely light us up from 3. If we play man, they'll put Jah in a million ball screens and either get layups b/c we're overcommitting to stop the 3 or, if we go under, light us from 3. Throw in Niang and it's just a bad matchup.
Now, does that mean we'll necessarily lose? No. ISU's not a good defensive squad either, and Jah will probably have a big offensive night. However, we're talking about a 50/50 type shootout -- and I think that's what we see in the predictions. Plenty of people think Duke could win. But, against ISU, it would turn entirely on which good-shooting team is shooting best.