I will clarify when I chatted to a keeper after the White Rhino feeding talk on my 2nd to last visit, last year (before I joined zoo chat and realised how important fine details are

). I asked him about the possibility of elephants returning to Monarto and he stated that Asians were now more likely. This as stated by others, was likely due to the changing dynamics in the eastern states compared to 2015 and our chat was before the announcement of 3 pregnancies at Melbourne, which probably would have pushed the switch to Asians further. On the off chance Monarto did go against the tide and import Africans for the aesthetic I'd imagine they'd likely be excess animals scheduled to be culled in countries with overpopulation issues such as Eswatini or Namibia (which fits with their Etosha theme). This is all very far off though and much will definitely change.
Also, a speculative question, if Asian elephants are chosen do we believe Monarto would display them as an ambassador for Africans within Wild Africa, or would they be displayed in "Back from the Brink" section, or even better yet would Monarto go all the way and construct a Subcontinental Safari section with Blackbuck, Waterbuffalo, Indian Rhino and Asian elephant as the Spearhead.