Mike, that starapple looks a lot bigger than the pink ones i have. I'm guessing from your description of the leaf that your fruit is regular C. cainito. The C. auratum i have has no bronze coloring on underside and the leaves are wider and rounder than those of C. cainito. I'll try to do a leaf comparison shot. Also it's looking like the C. auratum tree will be a lot smaller tree than the starapple. Every single fruit i've opened of auratum so far has only one seed inside.