I see Crowder getting talked about being a potential role-playing 3, who provides defense and three point shooting but I don't think he's a lock to be a solid defender on the perimeter. He played center most of the time for Marquette and while positions are very fluid in college, it still meant he basically never guarded quick wings. If he had the athleticism of his hair doppelganger Kenneth Faried, then maybe, but he's only an average athlete. I don't see him moving his feet well enough laterally to be that good of a defender. Also, he plays hard but Faried's motor runs much higher.
Moultrie's draft status is an enigma. At the same time, it's just mocks and he could end up going in the mid-first round.
That aside, I think his age has something to do with it as, after transferring from UTEP and sitting out a year, he's four years removed from high school. He also started playing at UTEP so while he was on draft radars for his athleticism and size, he didn't have as much helium and exposure coming into this season. Other things: his motor can run hot and cold (it's not special), he's not a particularly skilled offensive player (I think his points are coming to come from dumps off around the rim, alley-oops, putbacks, maybe some jumpers), nonexistent shotblocker. If he drops into the twenties, I wouldn't mind him for his potential to be a rotational big who are hard to come by, even second bigs off the bench.
He's different from JJJ though. JJJ was even skinnier, a poor rebounder and overrated defender beyond his shotblocking. JJJ is much more skilled though. On paper, as second unit pairing, they fit pretty well. One provides rebounding and garbage plays, the other the ability to make shots and better shotblocking.