Yes some had 16, i noticed that when i tried to trade in game and there was a
-1 number for available slots.
After some days / weeks the 16th player was automatically released by the CPU.
I also made another fault, i think i traded someone from my own team, i read in another topic that this action will crash a dynasty too, because the players of the custom team have two IDs or something like that.
Now that i am aware of theese problems it works.
I simulated about 10 times and nothing happened , so i hope for the best .