FYI when Ben Johnson first started training as a teenager he was about 165 lbs and could squat maybe 300 lbs. When he started training heavily, and became a world class sprinter, he could squat 700 lbs for a couple of reps, and yet he still only weighed between 170 and 175 lbs. So within 5 years he added 400 lbs on his squat, but only between 5 and 10 lbs bodyweight (which I think was probably mostly water retention).
How do I know this, because I used to be a member on his coach's message board. Charlie Francis (R.I.P) was his name.
This is his message board: https://community.charliefrancis.com/forum.php
My handle on there is SuperSprinter. In fact I'm gonna make a post right now so you know I'm telling the truth