He never threw a pitch faster than 87 miles an hour, and most of 'em were slower than that. Yet somehow he struck out six. He's a sinkerballer, yet he gave up ten fly balls to only four grounders.
So I'll be damned if I know how he got the results he did, or whether they bode well for the future, but you can't put it any simpler or any truer than that we won on Saturday because of Jason Jennings.
The WPA breakdown at Fangraphs tells us that Jennings' Win Probability Added of .433 was more than twice that of any Astro position player.