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I do not agree with the 9 member team to maximize training.  The possibility of obtaining full training credit when a player plays 44 minutes permits the training of two players on the same position thus maximizing training for all 16 players by use of the replacement of players after 44 minutes. 
When a skill is not revealed, it is possible to obtain a relative information on that skill by noting the number of stars obtained in a game played in a given position.  It is thus possible to eliminate positions that obtain less than 5 stars for that position.  By changing the positions played by that player, you can get  very good estimation of his best positions without having the information of the actual skill strength.