Even though Bama returned 4 starters from a good OL, 1 (Womack) has been supplanted and 2 others (Cotton, RP) are playing different positions. So, only 1 player (JW) is at his old position, including the key communication piece RP at center. So, there were communication problems at first but they improved as the game progressed. Still, Bama had ~220 yards rushing with only a few carries and yards by the QB. Plus the "real" offense was only on the field for 6 possessions. The OL should be a strength.
In answer to the larger question: it's only one game, so we're all guessing quite a bit, but IMO, it would be a surprise, assuming Tua remains healthy, if this offense was not the most explosive Bama has ever had. Prior to this I would say Mal's '73 offense, then maybe 2012, then Homer's '89. This one has more skill and versatility and above all Tua, though Mal's wishbone was much more versatile than any wishbone of the day. This offense has everything: dt QB, OL, RBs, WRs, TEs - everything. The only slight question is OL pass pro and it will likely be at least "good".