But, is that a trend, or just selective endpoints?
FWIW, even in that 5 start stretch of 2.73 ERA, Jax had a 4.96 FIP for a 116 FIP-, well below average, and also a 4.84 xFIP:
https://www.fangraphs.com/players/griffin-jax/20253/game-log?type=0&gds=2021-07-19&gde=2021-08-16&season=&position=P
Although I agree that there aren't a lot of alternatives left at this point. We'll need Joe Ryan PLUS Jax and others, just to finish out the season....