That was a pretty play, but Georgia had a bad defense on the field
Here's what I saw
Georgia was running a cover 2 with an extra defensive back in for a linebacker. This was zone all the way, you can see that by the way the corners are playing presnap, where they are looking backfield/run first. The problem with this look is it causes a delay, but the play is designed so that the safeties can pick up the corner responsibilities.
What Alabama ran is called a Seattle. Its all about the angles.
From the left side, with the WR he takes a hard step outside and the corner still cheating in takes a step in that direction. The wide receiver then angles because on this play he has to have inside leverage. Pretty much any Corner will tell you that you're pretty much dead one on one if you give up the inside of the field.
The three back comes up and does a mesh, his job in a middle zone is to occupy a linebacker. The TE on the right's job is to angle to the middle of the field. By design the linebacker has to pick him up, but this play creates a devils choice for the Safety on the weak side of the formation (Where the ball eventually goes. The TE is pretty much the key here as the safeties in cover two need to split the field in half. But now you have a tight end in a mismatch with a linebacker going deep into the weak side zone. It doesn't help that the QB is eyeing the action on the strong side of the formation. The weakside safety makes the fatal decision that his corner should be able to make the one on one play with the wide out, the threat is that TE coming across the middle in a mismatch.
So where's the other safety? Again, he's seeing that Slot who has angled inside leverage on his man and is angling to the middle of the field. He has to respect it because right now there are three mismatch possibilities that the QB is eyeballing
The three back across the middle. The tight end to the deep weak side, the slot back with inside leverage on the HB attacking the middle of the field.
The WR on the strong side has one job and that's to draw the CB as far out of the play as possible and he does this by running straight to the flag on his side.
Now they're in trouble in Georgia.
So where's the failure. Its with the alignment and assignment of that weakside corner. By having him playing a run zone, he gave up technique and gave up his inside coverage. Once he did that this was over. The Safeties were compromised.
I would expect that if you talked to Georgia's defensive coordinator who had just received a huge sack, that he would expect Alabama to pass seam, or under zone. Or be really wacky and try to run something to the outside, this was a second down play, they were trailing by a field goal, he was thinking that the run game wasn't off of the table and that Alabama might think he was going to focus on the passing game.
What made this play work was the overload on the strong side of the formation and the angles of the routes. While we were looking at 4 deep routes, this really wasn't a situation from Madden where you run the hail mary and hope that you're athlete is in a bad position.
This play might not have worked if the corners were in man coverage and ensured inside coverage.
With man coverage you have the CB on the WR and force the WR outside. You have the outside linebacker picking up the drag route from the running back. You have the middle linebacker on the tight end with inside hip coverage while the safety eye balls it. And you have a one safety eyeing the outside weak side.
Just my two cents