I'm not putting it all on Kubiak. If you look at the last 2 games, I don't think they lost because of Kubiak or Rattler. In the 2nd half of those games, the receivers suddenly couldn't catch a pass that hit them in the hands, they committed more stupid penalties. I think both MSV and Pettis were both less that 50% in the Bucs game. I think Rattler only had 2 incompletions in the first half if I remember right, which means most of those came in the 2nd half.
And it's not limited to the offense. On the play where Mike Evans set the record, the play call was to double him, but the defense didn't. Honey Badger should have known that play was coming, DD should have known. The veterans should have made sure that they were on the same page. They didn't. It's like they went into the locker room, and all got high or something. Maybe it's a fitness thing? I don't know. But just blaming Kubiak is the easy answer, though he was certainly at least part of it.