We need to keep in mind that although (u)GA's DC may not be familiar with an offense like ours, their players' experience against our offense is certainly worth considering. Most of them went up against us last year, so they "know exactly what to expect" (heh).
Except, of course, that they went up against us with Vad as our QB, not JT. No disrespect to Vad—he's a great player and I fully appreciate the effort he gave our team—but it was clear that his skill set was out of synch with our offensive strategy, and I don't think we every really got the O running at full throttle last season. We got up 20 points on the dwags, but they managed to severely curtail our offensive production in the second half, enabling them to pull even in regulation.
If their D comes into this game expecting a repeat of last season, thinking they "have our number", they'll be in for a rude shock in the second half when we continue to extend drives, score points, and eat time off the clock. There's no way they could come back from a 20-point deficit this year, if our offense runs at 100%.