Theoretically, but if the QB decides to hold onto the ball longer than planned, which is epidemic on this offense, that blind side backer has a free shot.
Yes, but that is something the QB has to be aware of on this particular play. Throw it if its there, give yourself up and go to the ground if it isnt.
The TE can chip the DE when he goes out on his route, and he should. But that will help only so much.
If the QB wants to prolong the play he needs to be aware of the weakness of his protection and that is the backside DE.
Well point is, protection is necessary up the middle and to the side of the play. If this breaks down the play is a failure.