With regard to flex and Ronnie back in the day, flex’s exact comments aside, you have to realize that with the spectrum of various PEDs and such that are used to bring them to the stage, the amount of water and glycogen can vary hugely over just the course of the day.
I don’t recall which year it was, but I believe jay showed up to the Olympia finals (either later that at or the next day) a good ~8 lbs lighter than at prejudging. This wasn’t a loss of fat, or even muscle, but a matter of addressing factors that play into his visual conditioning.
S