50 Yard Zero vs Close in Accuracy in an AR Rifle

OK guys I'm a bit confused here.

I'm shooting a 1X red dot out of an AR-15. A lot of what I read says do a 50 yard Zero but here is my question.

If you have a 50 yard zero and you shoot at 25 yards...the bullet will hit 1 to 1.5 Low. So at 15 yards is it what? 2.5 low?

If you are really close let's say 5-10 yards and you have to take a precise shot and hit within 1" do I still need a 50 yard zero....and what not a 25 yard zero?

A 1X is a fighting optic....so wouldn't you want all the accuracy to be 50 yards and under?

Thoughts?
HK

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50 Yard Zero vs Close in Accuracy in an AR Rifle