Allow transactions after season over for keeper/dynasty
Settings are weak. There are 4 teams still active week 16 that cant drop kicker or extra defense heading into the off season. While the 8 teams eliminated have dropped kickers and defenses to pick up prospects the 4 teams that play in championship and consolation game are stuck.
Your league commish has total control over these features. They can lock teams or unlock teams at will.
You need to take this issue up with the commish.