The Illinois vs Northwestern game recently was the best game I've seen since the PUv NW game. Domask backing guys down is a huge part of their half court offense and IU will need to not only stop him with a big defender, but also fins shooters when he kicks it out.
I'd just let Mgbako guard him. He will have to actually defend to help IU, but it would certainly put to rest whether he really deserves to be in the starting line up.
Cupps and Gallo have their work cut out for them defensively too.
I have no idea why Woodson is starting Johnson. He has done nothing since the OSU game and really doesn't deserve it.