If it is real stuff, the dbol should have kicked in wks ago...White mentioned that he might be a non-responder, maybe, I've never heard of that, but perhaps a "slow" responder might be more accurate.
Even if his training and diet suck, he should still notice something, not magic, but something.
You said that "you" train the guy, do you use the same stuff from the same supplier? Otherwise, how do you know it's good?