@Pavel I’m presuming that there’s not a whole bunch of people that the staffer dislikes, and that the staffer isn’t feeling over-stretched.
A few people that a staffer has a dislike for is probably, all by itself, not a good reason to add another staffer.
If I ever make another game and more than one or two people wants to GM it, I do have this scheme to allow players and GMs more freedom about who they play with and an easy hopefully painless and not terribly feather-ruffling way to pass players off to another GM.