I think you maybe overthinking itThat’s when they air The Bachelor/Bachelorette. They’d have to dead the show altogether. It’s a two hour show and based on what I read, any time they’d air their show other than a Monday, the ratings would fall hard. That’s why timeslots are important. You could have the same show but if you mess with the times, fans might not follow it.
You just don't run it until February
NFL is only September to January, run DWTS in Winter/Spring/Summer
I personally don't think if NFL says you can have MNF back on ABC, no way Disney says "but what about DWTS?"