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aye i used to play my master league teams based on teamwork as opposed to other stats, sometimes leaving better players on the bench because i wanted to test what teamwork did....i found it most affected how passes were played and recieved, especially noticable on long passes and chipped through balls.
I find with master league which a few of us play on one team with fixed cursor in J League some players can take a season to come good, you really do notice the AI change from crap head down running into defenders to nifty dribbling and final balls in.