The first picture shows a solo alphonso on a branch, like an single child. It will receive all the nourishment from the mother tree via the branch and hence it will have the best chance of growing to its full potential.
The other three images show mangoes which are like siblings, in a way they will be competing for the same source of nourishment. In this case the fruit which is first is closest to the main mother tree or first in line will receive the lion’s share of the nutrients and hence will have the best chance of growing larger. Very often the later fruit wont even survive till maturity and will fall off due to lack of food.
Some farmers engage in a practice of removing the weaker fruit, hence allowing the other fruit to grow larger in size and have the best chance of survival.
Guess this is Darwin’s theory in play in a mango orchard – Survival of the Sweetest.