Ok. I completely disagree with your assessment. To me it looked more like a bracket zone that Jaire sat down in and when he realized King was beat couldn't get back quick enough.
(Also if Jaire is leaving his zone that long before the ball is thrown then that's some TBuck level of free lancing)
It's not really worth arguing about in any place imo. To me 2 CBs got beat by a pro bowl WR on a play. To you only one did. We can disagree all day on what the zone coverage was and who's responsibility was what. In any case I dont think either is a capital offense
I'm happy to agree to disagree. I will explain what I see on that play and you can decide once and for all if you think I'm full of it.
This play looks like a pretty clear cover 3 call with a blitz. King, Savage, and Alexander all have deep responsibility in thirds. King's responsibility is the near third, Savage's is center field, and Alexander's is the far third.
In defense of King, the Vikings called a perfect cover 3 beater. A shallow crosser sucks up LB attention, which means that Thielen's deep cross pulls Savage towards the LOS and away from his deep zone responsibility. Diggs then runs a skinny post towards that center third that was vacated by Savage.
The play is designed to create a one on one matchup by drawing off the safety help, and it put King on an island. Without Savage over the top, he needed to stick with Diggs. And because he wasn't properly set at the snap, Diggs blew by him and had a full step or more as they neared the end zone.
If I'm correct, Alexander's responsibility was a part of the field that the Vikings did not involve in the play. You see him at the snap dropping towards the deep third to the far side. But as he reads Cousins and processes that the other two routes are crossers away from his coverage, he takes off to try to beat Diggs to the catch point. You can see on review that when he takes off for the endzone, it's already clear that no receivers are running routes to his zone. I would call that savvy, not irresponsible.
He is successful, but tries to get the pick rather than knock the ball down. So you can knock him for being greedy. But by my assessment, it wasn't his job to be there in the first place. He was ranging out of his zone to bail out a teammate, and he almost pulled it off. So I put that play squarely on King for not being ready and thus getting toasted by Diggs, while not being too harsh because a perfect offensive play call exacerbated his mistake.