You cannot put everything in the flipped videos or they become too long (>15 min.) Direct teach allows longer explanations and a few digressions.
#flipclass
Not a SS teacher but I think discussing a resource's bias is a valuable activity regarding learning. So bring on the bias unless it's too base!
I recommended vintage film footage of the 1939 Madison Sqr. Garden Nazi rally to one of our history teachers just today. #flipclass