I'm thinking the way id base without getting too technical into formulas n shit that some people have done is to pick a handful of foundation movements and multiply a persons body weight by a constant multiplier unique to each movement.
So for example, pull ups would be constant, how many pullups someone can do
Then for squat, deadlift, rows take a persons body weight and multiply it by a constant.
So to compare two doodz, perhaps take their bench max and subtract that number from bodyweight * 1.5
So if a dood benches 315 and weighs 200 lbs, it'd be 315 - 300 = 15.
Other dood benches 400 but weighs 260 lbs, it'd be 400 - 390 = 10.
Then for squat, dead etc, similar math, maybe two times body weight, then add the results to the number of pull ups or something. Highest score = stronger guy based on their weight.