drug intake and calorie expenditure/training volume varies a lot more than metabolisms...
one guy can be on 5grams 10iu hgh clen/t3/dnp training 6 days a week cardio ed while the other guy 1 gram aas, no hgh no stims training and doing cardio eod...no need to say who needs more cals more nutrients to maintain muscle and lose fat at the same time...as Evan C said in his video - the secret is to find balance and do nothing less and nothing more than you would need to
If someone needs 500g protein - he is overdoing something: either too much training, too much drugs or stimulants if he needs 500g protein to maintain his muscle mass, normal healthy bodies does need that much protein
Today bodybuilders doing everything more - more drugs, more training (volume but not frequency) this leads to greater calorie needs and because of going very low carb (which is a mistake) - the protein needs is very very high to fill out all those calorie needs.
IMO Evan C is one of those bodybuilders who is doing everything about perfect - nothing less and nothing more than is needed. The guy clearly cares about his health so I can guarantee his dosages are very moderate, from the training videos you can see than he trains harder, he puts more effort in his training than other pros, but he is not overdoing the volume - again doing just enough - no less and no more than is needed, the same applies to nutrition: very moderate protein intake (compared to his muscle mass) and with carbs again he is not overdoing and not underdoing at 12 weeks out he still eats 4-6 cups of rice daily this is why he do not need 500+g protein daily at his weight - he eats carbs which is just as important as protein, carbs spares protein and fills out with calories...what about his cardio regime? You got it right - not less and not more than is needed 1x time a day 40 or so minutes a day
Now I can tell the scenario when 200 or so pound guy would need 400-500g carbs...the guy trains ed, hits every muscle few times a week at a calorie deficit (this alone ups the protein requirements a lot) on top of that he is on lots of fat burning stimulants, more aas and hgh than is needed for 200 pound guy (again he needs even more cals and protei nat the same time), further more he does hours of cardio ed and eats very very little carbs = this again adds even more cals to his BMI, and because of very low carb (and fat) contest his protein intake skyrockets and this when you got a 200 pound guy eating 400-500g protein (there are plenty of guys like this example in PM), which is not needed in normal circumstances but is required in his situation not to lose muscle