yes that 600 pound bench did absolutely NOTHING for Zack's chest it's so TINY.
It's not always the weight that builds the muscle, tension helps too.
Prince and Chic used to watch Tommi Thorvidson train at Gold's Venice all the time. They said he'd row 500lbs, but use so much jerking and swaying/cheating that his back was about the only muscle NOT being used.
Dorian used a ton of weight on rows, but he also controlled the weight too. Then again, Ronnie's back was just as good and his form sucked....it is what it is.