Apparently that season can be completely ignored. As can the fact we shipped 7 goals in 5 matches against Barcelona, Tottenham, Real Madrid with Benatia playing last season. If you don't include the meaningless Barcelona 0-0 in November without Messi, it's 7 goals in 4 matches.
Bonucci was apparently poor in 16-17 because of the CL final exclusively according to certain members. Never mind that he played 1100 more minutes that season than any of our other CBs, a season we won a domestic double and conceded 3 goals in 12 CL matches before the final, a season he was one of the biggest reasons we even got to the CL final and won that domestic double.
Anyways. It's all irrelevant as Allegri clearly rates Bonucci as far superior to Benatia. And that is all that matters.