Kaufusi and Neilson actually have the ability to play above the rim; the other two don't.
Austin probably could, but for some reason he doesn't. That makes me nervous for Neilson. Neilson should be blocking shots and getting boards six inches above the rim, but Austin showed enough hops to do that at one point as well. Kaufusi is the only one who shows any inclination to get off the ground at this point.