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If he isn't doing that for a zillion reps I do not see how thats affecting him any further than his forearms.
I saw fantastic progress working heavy sets of 5.
Put 30kg on my 5s after 5 weeks. Only did it once a week.
Your will need some monstrous dumbells to get any decent weight to affect your back. What else would you be able to do with 50kg+ dumbells? a barbell with 100kg of weight however...