Roenicke had some command problems early in the season. He's been better of late and still Ks a ton of guys. He'll move up to AAA soon.
Majewski has been lights out of late with a lot of Ks. Could it be improved health? I think he could possibly take over Fogg's spot in the Reds pen. Fogg is a starter and doesn't seem to have any role on the Reds.
The other two relievers who've been great are Herrera at AAA and Manuel at AA.