More times than not, I have seen poor shots hit when the group in front waves the faster golfer (compared to them) through. I think what happens is the golfer being waved through, gets out of their rhythm, and/or loses focus. The golfer tends to get in a hurry, and plays faster than normal. Golfers who get into too big of a hurry, hit poor shots. The golfers who are waving those behind them through will not speed up, and they shouldn't have to. This would change their own pace of play, which would poorly effect their own rhythm. Sometimes they wave the faster golfer through because they know that golfer might hit a poor shot. Myself, I will not play through even when asked, unless the golfers in front of me get completely out of my way, and I mean completely out of my way. I will never be comfortable hitting a shot with other golfers standing near my intentional landing area. Yes, this slows my own rhythm, pace of play down, but I have a very good pre-shot routine which nullifies any slow downs I might encounter when golfing. I remember once while playing up in Mesquite Nevada, (Falcon Ridge) four of the locals I was following waited on their next tee box for me, and asked me to play through. They were in two carts, and I was walking. I did play through, and hit a decent driver. Once at my ball preparing for my second shot, balls start landing near me from the guys who just let me play through. So, I just wheeled my trolley off to the side, and waited for them. I told them to go a head and play through, since I did not like balls being dropped on me. All four them hit poor, second shots. The rest of my round went fine. Not so sure about theirs.