I honestly don't think it was a miracle. I'm not saying Keenum is a starting QB in 2026 or anything like that but the dude is an experienced QB who has had success in the NFL. He was brought on as an expensive 3rd QB because of his experience and ability to run an offense even with diminished skills. Pair him with an offensive psycho who likely spent his idle time building an offensive gameplan for Keenum in the event he was never needed because why not, and you get a QB primed for some success.
I'm not saying he can necessarily do this for an extended period but I'm leaning towards preferring him vs the Jets, though as I've said here I'm not as big of a fan of Bagent as others are (think he's fine just not this starting QB waiting to happen)