Am I missing something, or is there a reason your friend can't follow SS while you follow 5/3/1? Follow a M, W, F, S schedule, lift in a power rack, and you guys can workout together. At least that way your friend can still reap the benefits of higher frequency and linear progression. Because if he's a rank beginner, he's just waisting time on 5/3/1. Shoot, he'd be better off just squatting, benching, pulling, and pressing once a week with linear progression than he would be following 5/3/1. At least that way your friend can add 5-10lbs a week to all his lifts rather than 5-10lbs a month. 5/3/1 is designed for slow (very slow), steady progress...not exactly ideal for a beginner.