The complete ROM of a chin up is when the upper arm (biceps and triceps) are in line with your torso (or slightly behind your torso), no matter where your chin/chest is compared to the bar.
One thing to know before doing that marine test, is how they count each rep. Is it just chin over the bar, or full ROM? Is it all the way down, or half down?? Once you know how they count each...
It works, and it works damn well. Re-read that last sentence over and over. It's called evidence-based : if something works and there's no 'scientific super explanation' about...
Exactly, with whey/water, you're absorbing the protein very fast, and not letting anymore protein in your digestive tract for the next couple of hours. Is faster always equal better?