You also can't really teach grace and coordination, though, and I'm not convinced those are things Hasheem will ever have. Semih is more skilled and coordinated than Hasheem is. I'd rather have Semih on my team than Thabeet. All Thabeet can do at an NBA level is block, and he gets a ton of fouls.
I wouldn't say Dikembe was either graceful or that coordinated but he did very well in the league.
I don't think I'd call him uncoordinated. It takes athleticism and timing to get all those blocks.
Not the same kind of hand-eye coordination required to dribble / lay-in / shoot a basketball, or the full-body coordination required to perform even simple post moves, etc.
Also, given Hasheem's utter lack of basketball experience relative to his peers (he's only been playing for a few years), it's hard to envision him developing into a smart player any time soon. There's something you just can't get back as a player trying to start playing a sport in late teens / early 20's versus players who have been playing a sport their entire lives.