Owners: Our rules disallow drop/adds of RBs, WRs, TEs after the playoffs start (which meant week 15 this year).

I failed to enforce this – if you wish to fire me as commissioner, please do so!

But with COVID, I think we need some leeway. SO – therefore, I have made a commissioner’s decision to permit COVID-related transactions, but otherwise I will enforce the rules for weeks 17 and 18. This means:
Week 17 – you can drop a K for a K, or a QB for a QB. You cannot make any other (non-COVID) transactions.
Week 18 – no (non-COVID) transactions permitted.