Train a SA is basically a impact of adding a +1* in some skills, basically internally, and like unlock a manner to play but sometimes the impact is not perceptible because I guess the base of effectiveness or contribution of a player is so low.

I prefeer the players like I know they are and improve 50 points a player really to overcome more situations... then bst SA's for me have been defensive wall and aerial defender, too 1vs1 GK... I had sometimes 5 players with FK spcialist and the best man was another as the DC or GK,....

All is more extense rally, maybe can work a SA not in players that do nothing, but in players that have a good contribution inside the team, some good 8-9 ratings sometimes... mayeb in that cases this slightly improvement can be perceptible....