I have some very bad news, it is a mode breaker for me. I just spent the last hour simulating 2 months at a time, each time using a different maxed out training discipline to see which one would increase the teamwork stat. None of them increased it!!!
This could mean that if you simulate matches your stats do not increase, or that teamwork is increased by a method other than training, or the mode is broken.
This destroys ML for me as I do not want to play with a team of statues which is the case with the original line up. Also if you start with an real line up, as soon as you buy a player they will become a statue because of their teamwork stat which plumments when they join the team.
Does anyone care to replicate this experiment to see if they get a different result? Konami need to be notified if it is indeed broken and it needs to be fixed sharpish with a patch.
You've never played ML before have you? If you did you would know that this has been the case in PES since ps2 days. When you play a new player he has to adapt, sometimes he doesn't low teamwork or not, but after playing him a few games his TW will increase exponentially until it reaches his TW default numerical stat, and after that it will increase slowly to just make him a better allround player.
At least that's how it always went afaik.
Also this whole simulation test thing is bogus because when you play the games, the players will develop much better and faster.