Chiefs could be playing 3 games in a 9-10 day span. During the Patriots/Chiefs game they were talking about how the Chiefs had done that before, so it's not unprecedented.
I wonder if that option, while not ideal, could work for the Titans to make up games.
Once they get the outbreak under control, play a Sunday as usual, stick a Thursday night in as the make-up game, and postpone their following Sunday game to Tuesday. Obviously, some other team is going to get stuck playing 3 in 10 as a result, but it's a way to make up games without adding weeks.