RJ's blind EX girlfriend said in season 4 that rj is not taller than 6 feet 
So, it just can be 3 out of the seven suspects:
-Brett Partridge
-Bret Stiles
-Gale Bertram (not sure)
AND: The list of the seven suspects is not a fake. Bruno Heller himself said so.

Sorry for my bad english....:c