^^ I believe you answered your own ? There!

remember their using huge amounts of GH(15+ iu 2x daily) along side cycles(most do SBC'ing as we know) it's a slingshot method - also, the amounts of AAS are huge resulting in getting past any plateau by upping their dose if they stall by 2x or their a bouts... GH is the fvkin fountain of youth and as long as they've been on it - at those doses they're actually starting to create new muscle tissue(IGF 1 #'s are insane which promote new tissue - couple that with the AAS they use - it's not to surprising w/they're work ethics w/the amount of drugs being used