Yeah while white rhinos most sociable rhino species, with Memphis as a male, yeah they might be less sociable generally but imagine seeing others of their own species is really important and total isolation from their species is not great for any white rhinos, but think hopefully the females will arrive fairly soon and think Memphis will be ok in the meantime, he has the best keepers one could ask for so they will look after him.
You probably know all this already but he had a brief companion in the early 1990s after Mwivi died, 'Calfie' a young (think Red Angus cattle) calf who kept him company until Memphis sent him flying with a playful thrust of his horn and snout ('Calfie' was ok though, left to go to a farm) believe he shared with a male eland for a short time too before that (believe the eland went east maybe to WPZ possibly returning there before the Savannah precinct opened to the public, think 'Calfie' joined Memphis afterwards) but he did really really well by himself until late 1999 (though everyone was very happy when Katala & Sabie joined him - was a big Memphis sized and shaped in his likeness platic 'piggybank' between the entrance and the main lake with a sign saying s'Mate for Memphis' (think more words explaining underneath) and visitors could put money in, which so many did, remember seeing other visitors putting money into too multiple times, was there c.1995-1998 - but sorry am straying from his current situation with nostalgia).
Oh cool will be great if you visit next week, give Memphis a wave hello of love from me if you get a chance (have not been able to see him in 19 years since last visited so have missed seeing him, Bakari was a calf when last was there).