This idea is so crazy. I love Clingan, but the truth is He is no more dominant a defender than Thabeet was. No one thought Thatbeet would shutdown Okafor.
Before you trash Thabeet, 1) National Defensive Player of the Year, 2) #2 NBA Draft pick overall, in a much tougher Draft 3) 7"3" 260lb.
I loved Thabeet because I was huge on us being a premier shot blocking school after Okafor, Boone, Villanueva, Hilton, etc. He really was an elite shot blocker, but he was just an okay rebounder given his size, and really hadn't been refined offensively at all. It's too bad Memphis way overdrafted him, especially considering the roster they had at the time, because I think his draft status made people think he was a bust when in reality he still had a ton to learn about the game of basketball and there was always a decent chance he didn't develop fast enough.
Thabeet had really good timing for a guy his size and probably a better shot blocker at the college level, but Clingan has a more well-rounded defensive game in my personal opinion. Regardless, I think they'd probably leave Clingan on an island vs Okafor just like they did vs Edey. If Okafor went 2004 Final Four on him, what can ya do, it's Emeka.