I have the SimpleBGC Alemos board. (Perhaps I should say "had...")
I have a Futaba R6202SBW connecting a Naza 2 with SBUS. Channel 1 SBUS goes to Naza. The Rx only has 4 ports.
Connected Channel 2 from the Rx to the SimpleBGC and up came the smoke from the board... So my first guess is power should have been disconnected from the servo wire.