He might be power training his team too. If he has invested in loads of Green packs, he may be training almost non stop with the team and replenishing them with packs. When I power train (almost always the first two or three games of the season, not mid way through it) I often arrange friendly games too to speed up the training.

Either way, sounds like he is investing serious time/money into the game. I find its best to let these types of players run away with it if they are determined to. No point in trying to out quality them on pride.