>Agency isn’t agent-relative but it’s agency itself.

.......lol?

> It’s a possession which everyone has in equal capacity

No, they really don't have an equal capacity. Not hypothetically, realistically, or even in any manner is it equal.

> no justifiable difference exists (you can’t say that one is more free than others)

Agency over oneself compared to not having agency over another entity is a massive difference.

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There unfortunately seems to be some big lapse in mutual comprehension here.