From week to week Fitzpatrick's arm is showing its age. For several weeks he couldn't hit anything deep or even shorter passes with any air under them. Then last week against the Niners he was rejuvenated, hitting every throw with depth and touch. And now this week his arm looked good at times, then very worn out at others.
I have to imagine they'll keep him in there until it looks like the arm is totally shot. He's 7th in the league in total QBR and is enjoying his best season for completion percentage at 70. With the bye week, he should be well-rested to go a few more games but I think that Tagovailoa's time is coming soon.