Re: deaf cat being picked on
I would keep them separated while you are gone.
Personally, I would keep the "new kitty" in a separate room, perhaps a bedroom, with another cat for company. Rotate the other other cats in, with the exception of the deaf cat. My cats sleep during the cat for the most part, so it wouldn't be cruel.
Skin kids - Jason, Kevin, Allison
Canine kids - Bennett & Bailey (always in our hearts), Riley, Banker, Rogue and Boz
Feline kids - Zoey, Talley and Abra