Regarding Stallone's possible whey usage for Rocky 4:
For a western bodybuilder or lifter to be using whey pre-Rocky 4 he would had to have known more about the biochemistry of whey protein and it's potential effects than any western sports physician - and have had access to what was then a relatively little known supplement. He would also had to have known more about how to effectively dose it than Scott Connelly, who would go on to co-develop Whey isolate just a few years later. As for before Rocky 4, nobody in the west can say for sure exactly when the Soviets began using whey, but the likely date is sometime before Rocky 3 and possibly as early as Rocky 2.