Glad you (Bovine) enjoyed the pics, thus here is a little more experimenting....
I have another smaller green seedling near a ditch that I just tasted and it was also one dimensional sweet only but once again a nice sweetness. This mango has a very small seed (the fruit was also a little smaller than other fruit) which is smaller and thinner than Phillipine or Okrung seeds.
I'm really not sure which seedling tree at a ditch it was so I guess I will save them all till next year. The seed has an unusual growth coming off it into the fruit brown to blackish. I have only had years ago the white calcium internal deposits in varieties like Venus but this looks really different but then again probably just due to such a young tree. I'm pretty sure the skin was not punctured by a boring insect making the black growth on the seed.
I previously tasted 2 other seedling trees bearing but have no pics of them. 1 was good tasting & 1 was bad tasting IMO... So 3 out of 4 is pretty good odds for me for this year fruit from seedling bearing trees...
Last year I think I tasted 2 seedlings and I was 1 for 2 (50%) thus grafted the bad tasting seedling.
The year before that I was 1 for 2 also on good tasting seedlings. Unfortunately my favorite seedling with a little pumpkin taste rotted due to being loved to death by a family member throwing mango cuttings too close to the tree trunk (probably) and thus forming an anerobic area/bacteria/fungus/etc. & unfortunately death to it. Since then, I have carefully explained no plant waste thrown at the base of the trees; only at the drip line.