1. development in players is half in friendlies compared to competitive games but half the condition is used and NO skill point is awarded for MOTM.
2. Should not make a difference
3. Power Training is using lots of saved up/farmed green boosters or bought green boosters to continually earn extra skill points on a select few players in your squad.
4. Adding SA doesn't increase player value. but it does enhance performance depending on what ability the player has and how it is used.
5. Yes
6. More supporters give you more possession, thus increasing the amount of chances you have to score goals, this is highly useful in AWAY games, since playing at home gives you +13% if you have max attendance +5% (or capped attendance on some levels) and you watching your game gives you +8% assuming your rival manager doesn't watch the game.