There is no way for us to know for certain, let's start with that statement, shall we?!
Afterall, we cannot know the play design, the order of options, nor even what his keys are...
Now with that said, to this fan's eye what I see, especially when looking at the all 22...
As I said in the other thread, it appears that either he does not know how to properly read a defense, but this I mean, look and see not just if it is man or zone, but what type of zone? Which side of the formation is zone or man, but also, what is his best option knowing the coverage, routes, match ups.
Against the Steelere, when they went man, they used a linebacker to cover Snead when he was in the slot. This left him open often.
When they went man, the left a single high safety, meaning either side of the field would be one on one on deep routes, a look or pump fake would move the safety away.
So is Lamar just looking for Andrews over the middle, or who ever down the seam? Is he seeing the coverage and just ignoring it?
He rarely throws timing patterns, when was the last time we saw a deep out or a comeback route? Timing is vital in man coverage, even against match up zone. If he can't read or make those types of throws, it limits the types of routes, which makes it easier for defensesnto defend against the pass.
On the endzone throw to Snead to end the game, Lamar either didn't read the coverage right, or ignored it and wanted to force the ball to Snead.
He had two better options based on alignment, Brown from the right side on a skinny post, DB was shading his outside. Or Boykin who had single coverage on the left, DB shadimg his outside. The Steelers were forcing all the coverage to the middle, which left plenty of room for either throw, but none to either Snead nor Andrews.
The play was there to win the game if Lamar made the right read, then threw a good timing pass to either Boykin or Brown...
This may speak volumes to where he is as a qb right now, and why "no one is getting open".
But again, we are just fans, don't know his progressions, the plays..