I agree with Tim. If the guy is serious he should realize that you crawl before you walk before you run. If he doesn't have the mobility to do the lifts he's going to be crawling again with injury.
I've been playing around with Super Joints and Relax into Stretching by Pavel, both have increased my mobility (and I can get a full on ATA squat) further, and I feel stronger in all lifts because I'm not limited by any mobility issues.
Almost 3 years ago I couldn't go below parallel in the squat at the ripe old age of 28. For this guy he has many more years of inflexibility and that needs to be taken care of first.