Yep! The other four (i.e. the canon het*) are there, but not poor Brian. Not that people wanting Bender/Brian couldn't get around that by just requesting Bender and saying in optional details - after giving some solo prompts for Bender - that also they ship him with Brian if their writer is so inclined.

*I could be wrong and this could be somebody who wants Andrew/Bender and Allison/Claire, but 'wants canon het' is what it looks like without additional info!