Very good points. The receivers we have had for most of the year were the bottom of our barrel which is not a good thing. They are also paid to play a sport and do a job and they as a group have let us down several times this season with the drops and generally just trying to hold on and do their best, but the overall talent wasn't there, and it showed bigtime.
Even with the leadership on defense they had some hard times just like the last play to Evans that you described, and we all saw the lackluster efforts they put in towards Allen's exit. Both sides of the ball have failed us this season, well really every area from coaching to special teams has had massive cave ins and brain farts.
Kubiak had some issues adjusting but I thought he did well enough to warrant another run at it. I wouldn't want to have to try and come up with a game plan and then lose 4 players by midweek and try to adjust again. You could see in some games where he wanted to establish the run and it didn't happen and when you are depleted along the offensive line and you are dealing with a rookie QB and no Taysom, Olave and Shaheed that's earning your money and it is part of the job but some things do need to be looked at in a case by case and each individual needs to be looked at and reevaluated. Kubiak shares some blame, but he is far from the reason as to why we were so bad on offense.