What kind of nonsense is this? I have been bodybuilding since 1958. I have a clue about what the champs do. I am not suggesting he go 'heavy' but using such light weights was a surprise to me.
Ronnie Coleman used super heavy weights and got injured. So, yes, stay in the safe zone. However, why use those light weights in a video to show his fans? Disappointing.
those fans can't look for his offseason training videos?
he should risk getting injured because his fans are too lazy to watch his training videos during his growth phase (of which he has a ton) or too dumb to realise he is on extremely low calories close to a contest, has a depleted energy stores and is not going to grow any muscle during this period??
also heard you mention full ROM,
maybe research training in target zones where injury response (micro-tears > hypertrophy) is greatest as well as turnaround point of rep generating most force thus recruiting most motor units only in the target zone, reduced at full stretch or full ROM.
also benefits of stretch overload combined with the above.
full ROM is one of the biggest myths in bodybuilding.
can effectively grow muscle without full ROM and maybe more ideal even.