You might also want to consider teaching your friend some really bad squatting technique... Because a guy is a gonna get a 100kg squat in a matter of weeks.
This is what I'm afraid of. He's on the other side of the country so I can't pull a Tonya Harding either.
Thank you for the post Dave, it has definitely given me some things to think about. I like the ladder idea. How much of an negative effect do you think it would have to switch up between front squat and back squat? Like maybe a month of the ladder back squatting, a month front squatting.