I only remember one play where he was in zone coverage and Jackson basically threw over him. But if he drops back a bit like Moose suggested in the broadcast then he gives up the easy pass in the flat. It looked to me like it was Fuller who should have been over the top there but wasn't. Yeah I agree though another good game from him.
Rams line up in Cover-8, motion turned it into cover-6, but either way Cover-2 to that side of the field ... there was safety over the top but was pulled by the double slants. I don't even think it was a called slant and go/fade.
Left side was = tosser (two slants) concept, right side = stick (3-man concept). Jackson's reads would bethe stick, then first slant and then second slant so OBJ was Jackson's third read but his looking left first drew Johnson a bit and that is why he was late getting over OBJ.
In short, adlib play, almost like a sramble rules play ... and Jackson had too much time ... and was able to get a pass over a cheating RCB.
And Moose, I am sure, was right. If Kendrick stays in the flat that slant would have been available if first two reads not there.