Concerning Contradiction between delegate-stack-stx and stack-aggregation-commit

[neogranicen]

I realize that one shall call delegate-stack-stx for each delegator and for each call-specific height and a pox address is given. Then stack-aggregation-commit is called with one pox address so if the addresses set on multiple calls on the former function are not the same as the single address set in the later who will override who or will the whole thing fail?

In addition to this i would want to know the difference between stack-aggregation-commit and stack-aggregation-commit-indexed.