Whatever. Busted screen passes happen, good QBs tend to throw the ball into the dirt though.
In the second gif lets say you replace him with a QB that buys time with his legs and is able to get the throw off, maybe even for a TD. If you replace him with a QB that has good pocket instincts then the sack likely doesn't happen. If the sack doesn't happen then you can't blame the o-line for not holding up. That is the rub when trying to assign blame for sacks in a vacuum. Just look at that nice play from a few seasons ago when Tannehill escaped a would-be sack and threw a TD pass to Matthews. The defender had Tannehill in his grasp but Tannehill was able to get away, had he not gotten away then you would have simply blamed the o-line but as we know even though the protection wasn't perfect there was a play to be made, because he made it. Thats the problem, he doesn't make plays like that enough. Thats what I see in the second gif, an opportunity for the QB to make a play.