Perhaps attempting to match up better with the Steelers' taller pass-catchers? Also, perhaps partly to get a read on Rowe's playoff readiness (coming off his injury) with a full game under pressure?
This is the time of the season when BB & MP often seem to provide significant game reps to a lot of different DBs when they can, presumably to enhance their playoff readiness. We might see a surprising amount of Bademosi and/or JJ this game or in the regular season finale to help prep them.
In some ways, these last two games may be a bit like the end of the pre-season. It kinda is the "pre-season" for the playoffs.