If he's Kareem Abdul Jabbar circa 1985 and he's four seconds past everyone getting the the low block, but once he gets there he can either skyhook you or make a good pass, then OK. But Riek has the offensive skillset of Manute Bol minus the three point shot.
On defense we would have to learn to account for his man every time down in transition because he'll be the last one back. Our guys have enough trouble accounting for their own guy much less Riek's.