Recall that Praise 92.1 also did fairly well, with 6+ numbers that approached Boom 92. While it's going to skew older, you can package it with KMJQ. From a cluster strategy standpoint, it's a format they know, have the internal resources to do inexpensively, and helps them deliver African-Americans from age 18 - 54 across their formats.I think Radio One is simply out of ideas as to what to do with 92.1, which is why they trotted out a failed format from 15 years ago for the latest flip. It still seems like a placeholder, as the HD-2 simulcast on 102.1 is co-branded. Why would they keep that simulcast and promote it? I could have understood a few weeks of running both signals to allow the audience to move over to 92.1 before dropping the HD-2.
As for the HD-2, we all know that HD-only isn't commercially viable. But keeping the format there doesn't cost them much and fills in coverage where 92.1 isn't strong. Unless someone comes along and offers to lease out that HD-2 to feed a translator, you might as well leave it alone.