So, I'm rewatching the play and I'm honestly not sure that it was Cover 2. All defenders follow their man and try to force outside releases.
But here's the kicker for me- Jimmy allows the outside release and immediately comes back inside with his body (if it were Cover 2, he needs to jam and force an inside release so that Weddle doesn't have to defend the sideline). Like, he presses Adams to the sideline and then takes the stance of Cover 2 and appears to actually look to the receiver going to the flat and takes a step downhill, but whoever was covering the TE follows and it appears to put Jimmy in an awkward spot because he then tries to get back to tracking the deep ball.
Not entirely sure what happened, but that was a really bizarre play and I have no idea what was happening there. Jimmy wouldn't just let someone past him for free and there's no reason for him to take a step downhill if he didn't think he had that responsibility...