It's highly unlikely that the Bengals will be in a scenario where they can rest their starters. The problem for them is that they have the tiebreaker over New England, but Baltimore as the tiebreaker over them (the Ravens would get the sweep if they win in Week 17). In other words, the Pats need to be two games ahead of the Bengals and the Bengals need to be two games ahead of the Ravens for them to be locked into a division title with no bye.
Basically, the standings need to look like this: Pats 12-3, Bengals 10-5, Ravens 8-7. It's possible, but you're relying on a lot of separate things to fall into place.