Bill Simmons' Bad Announcer Jumble

From Bill Simmons' ESPN the Magazine column about The 33 Ways to Make Sports Better:

27) My bosses won't allow me to say which six announcers I would deport to Eastern Europe, but here are their initials jumbled together backwards: WBMABCMJMTBJ.

This wasn't just creative method. There are answers in the jumble. The letters aren't scrambled but the first and last initials are switched in each one and with that assumption I deciphered the following:

Joe Buck
Tim McCarver
Joe Morgan
Chris Berman

I say "Amen" to three out of the four, I think Joe Buck is outstanding and am disappointed he won't be doing the BCS games for Fox this January.

If you kept to code you'd guess that WB and MA are actually BW and AM. Before you say "Al Micheals, dumbass!" Simmons has devoted time on his site to name moments in sports he wished Al Michaels broadcasted (including the 1997 Survivor Series). I have no clue who BW is.

Who are AM and BW? Thoughts?