1) the system Will divide the SP the same way by the 3 categories,
2)physical and mental have to be similar to defense for a defensive player or to atack If it is a ofensive player, the third can be a litle less, but a good player need to be balanced.
3)the system detect the SP not assigned, dosent work saving them.
1) If a player dosent perform after 10 games or in friendlies against easy team, it Will probably not get better, you can wait until the next season to see If he gets better, with scouts works sometimes.
2) on level 3 a 18 years old can be up to 5M the fastest trainers, level 4 8M and so on.
3) they Will continue as 1star player.
1) yes nacionality of youth is the same of the manager
2)no you always get a free 2star and a 4star or high 3* you have to pay between 12 and 24T
Mourinho team is almost invencible, the chance of winning is probably 1 in 100 or you need a team full of 9star players