shane Mosley's jab

i was just under the impression that heavy weight lifting limits quick hand release, flexibility, and makes you more sluggish in the ring. I know he's no expert on the subject but manny steward believed heavy weight training was the reason kirkland looked very slow and sluggish last weekend against molina. then again maybe it was molina making him look that way! i know there is a proper way of going about it which won't limit handspeed or flexibility (low weights with a lot of repetition). I guess it all depends what boxing paradigm you subscribe to.