I know a little something about the platelet rich plasma treatment that Lynch is undergoing as I am undergoing the same treatment for a torn rotator cuff and torn labrum. I am 4 months in and feel i'm about 65% back. This week the doctor has just given me the green light to resume golf and hockey. Golf has been ok with a little soreness and hockey is also ok. As far as hockey is concerned, I'm obviously not competing at the NCAA level with lots of hitting. I could not imagine at this point in the process taking hits like you would in NCAA football or hockey - that's the bad news. The good news is Lynch is much younger than me and I would expect him to heal faster. I also don't know the difference between a knee and shoulder injury. I would suspect that for the knee it definitely has to do with ligament and/or tendon tear, although I have no idea how severe. Taking into account age difference, and the fact that its been 4 months for me to get to 65%, I would think he could be close but the fact that its NCAA football, maybe it would be a little longer. Here is an interesting link to a Sports Illustrated article on what it has done for MLB pitchers:
https://www.si.com/more-sports/2011/08/03/nitkowski