While I somewhat agree with Rat about 1st and goal from inside the 5 and getting turned away, I view it as a whole-offense failure more than a Geno failure, and including Grubb. It's harder to throw to score in the Red Zone with zero time to throw and compressed spacing. Detroit blocked Geno's throw on what would have been a TD pass to Tyler Lockett. There is no real excuse for the 4th down play where the center snapped the ball at 1 second rather than get a delay-of-game penalty, and Geno wasn't ready. It's on Grubb as well--I thought a QB draw or at least one Walker run coulda, shoulda been included.
All that said, Grubb is a helluva OC and I'm super glad we have him. Geno is an excellent, gutsy QB and the Hawks are lucky to have him. Both are cursed by a crappy OL that isn't protecting Geno and isn't generating push in the run game. This failure is actually a good thing. The Hawks will be in this situation again, with more on the line. Grubb and the offense, after some soul searching, and lots of film study, will come up with some better plans for this situation in the future. That earlier middle screen play to Walker was a thing of beauty, but may not work in the compressed space here.