It appears, to my eyes, that for many of the Leafs, their bouts with COVID-19 are having lingering effects. What really stood out to me was just how much better the top line has been than the rest of the team the last few games. Bunting, Matthews and Kase have all managed to avoid COVID this season (Kase entered protocol earlier today), and they seemed to be the only line that's really firing on all cylinders.
John Tavares specifically has looked different since his bout with COVID.