Ive wrote a little about him on the "two earlier to talk about the draft" thread.
Having watched a few of his games I personally see him at best as a Brendan Haywood / Greg Ostertag level defensive center. He is really big, I would guess 7' in shoes and over 270lbs with great length. He runs the court well for his size but I would not consider him overly athletic. Probably comparably to Hibbert. He really lacks any type of advanced post game but seems surprisingly comfortable with the ball in his hands on the perimeter. Obviously he really excels as a shot blocker he has great timing and is able to block alot of shots using his length and not jumping. This sets him up for second block opportunities and also helps keep him in rebounding position. His man to man and pick and role D are a concern because Washington primarily seems to stay in a 2-3 Zone. So like Fab Melo the jury is out on how his mobility and skill set will translate to NBA defense.
In terms center prospects after Okafor I would rank him after D Johnson and J Poeltl. I think both Johnson and Poeltl have higher ceilings. Johnson as a post scoring option and Poetlt as a well rounded defender. I do think Upshaw will be a solid pick in the mid to late 20s and could contribute early in his career if he makes an ok transition out of the 2-3.
Okafor
WCS
Poeltl
D Johnson
Upshaw
Disagree with some of your points. How do you have poetl and d johnson over upshaw? Yes wingspan ,size, athleticsm do count when it comes to centers. Poetl is an unathletic , weaker version of vucevic. D johnson has a 7-0 wingspan. Doesnt bring much skills to the table. Good backup center potential in the NBA.
Upshaw i doubt will turn outl like a dud like melo. Upshaw imo is another Speights without the headache/bad attitude. Look at a mature Speights now and how good he has been for GSW
Upshaw could really climb on draft night if he keeps playing well. And while WCS specialty mainly is on defense , upshaw is a two way potential. He gets the right guy to refine his game, gains 10 more pounds of strength and he will be a load to deal with in the nba