I wonder why didn't the group that gave Brandy her start as a backup singer Immature (later IMX), or at least one of its members ever guest star on Moesha.

Was their any bad blood between Brandy and one of the members of the group, was it because Marquous Houston aka Batt Man was a regular on the WB's Sister Sister, or it just never happened.

If it there was some unwritten UPN / WB rule, the stars of one network can't guest star on the other network sitcoms, it didn't stop Shar Jackson from guest starring on the WB's Steve Harvey Show, or from Merlin Santana from revising his old Moesha role in the episode Independence Day.