I was thinking it was desirable because it's got genetics from 3 species all in one plant, and of course the red skin.
But the flavor to me was not sweet enough, and the texture was just barely mealy...really did remind me of a bland geffner, with more mealy pasty pulp, and traces of custard Apple flavor.
Well yeah, the genetics from 3 are there, but without specific traits displayed that you're after I don't know that I'd use it as a starting point for breeding. For intentional plant breeding I thought the two main approaches were:
1) Pick just one trait (say red skin) you were after and breed a plant that shows that trait with another one that's just generally top notch and may or may not have that trait. Then from the seedlings select individuals that show that trait and are the best overall for other qualities, and use them for further breeding to stabilize that trait you're after.
2) Breed exceptional individual plants together and see what you get.
Outside of red skin I don't know that 47-18 has any exceptional traits that would make it a starting point candidate for further breeding.
I do think given the lackluster taste quality combined with beautiful appearance, it might make a good candidate to graft on to front yard atemoya trees so fruit thieves steal it instead of the good stuff. You know, just graft one branch to 47-18 so they see the bright red fruit before the good stuff that's still green and camouflaged.