about the injuries
if you have a barely legal (in a non giggity way, giggity) youll rarely see injuries. i confirmed this a long time ago by cutting down from a full 22 men squad, to an only 5 sub bench, and finally my current squad with only 3 subs
with a full squad, ill get around 8 injuries on the opening day. with a 5 i got around 3. so far with only 3 subs im clean, and ill usually have my players go on vacation (long injuries) right at the start of the season

now heres my little theory: youll only receive injuries from matches until you only have 2 subs. they can have no stamina/morale whatsoever, but yeah theyre unvulnerable. this excludes training though