Marshall and Madson are the late innings guys. Other guys who could cover seventh and eighth innings are Bray, Arredondo, and Masset. Ondrusek and Lecure middle innings.
Chapman could possibly throw longer relief if the Reds go that way. He would have to replace one of the other seven.
At AAA, most likely, guys like Judy, Horst, Brackman, and the two veteran lefties Reds just signed.
In addition to Marshall and Madson, I have particularly high expectations for Arredondo next year with injury in his rear view mirror.
This could be one fine bullpen.