I know UGA plays a "3-4" on defense, but it usually looks like a 4-3, to me. I often watch the QB and linemen point to someone on the D, but often as not, the defensive alignment looks exactly the same as every other play, to me. I know the OL is calling out blocking responsibilities, OK, and maybe the QB is doing the same, perhaps to the RB if it's a pass, I don't know for sure. Then we see audibles called, and I don't know what sparked that in the main.
Of course at times the LBs are crowding the line and in a different position, but then they drop back, or a DE drops back. On some plays I can see just before the snap a blitz is coming of course. I usually can't see that 4 seconds presnap though.
It would be fun to have them miked up, to see who is calling what.
My GUESS is the center is a critically important position for the OL to do well. Miss one blocking assignment and play is blown up.