If they did, it was extremely well hidden. Usually those conflicts get out, at least to a point. But who knows. From everything I read, Coughlin had a HUGE change of attitude last season, all for the better. He was a coach who had totally lost the players and somehow he managed to do a complete turn-around and win their trust and affection back, not to mention the title!
It's possible that there was a conflict. I also think it had to kill him to WATCH his team win and not be a part of it. Not to mention ego bruising that they did so well without him.
Whatever it is, I hope he's ok and can get back to the level of playing he used to be at. He's so talented and I love watching him.
BL19 Starting weight: 151