Lets say someone goes on a bulk and they gained 10 lbs of lean muscle mass.
The whole time he followed routine X, which did not include squats.
His friend, decides to follow routine Y, which is practically identical to routine X but does include squats.
Now, the squats are going to release more testosterone into the friend so in the same amount of time the friend should gain what? 10.1 lbs? 11lbs? 15 lbs?