I think you'll find he has played 4 times for Ghana, so hardly Ryan Doble.
Agyemang, in fact no player worth their salt, will drop down a league to sit on the bench. It's simple really, why leave a club top of the league above to join a team the league below and do exactly the same thing? It makes no sense, if he did come here it wouldn't be as "cover" or "back up", i dont see why this concept is so difficult for people to grasp.