Yea, there's nothing wrong with that. QB's sometimes know WR routes better than the actual WR's. QB's are usually the smartest players on the football field, they know the game the best. For example, Josh Heupel was a TE's coach at Arizona before being offered the QB's coach at OU.
But what ever happened to that QB coaching job at Emporia State for Jonathan??? I guess this job blew that out of the water....