I take your point. Its arguable though that if Aragorn had just walked in & claimed the High Kingship while Denethor was alive he would have split the realm & we'd have seen a repetition of the Kin-strife. Denethor could certainly have claimed that Elendil had bequeathed the realms to his sons & therefore only the Heirs of Anarion had the rightful claim to rule Gondor. This was clearly Aragorn's fear even after Denethor's death - otherwise why not proclaim himself after the battle of Pelennor Fields? I note that Faramir asked the people at the coronation if they would have Aragorn as their King. Isildur did not so much 'relinquish' rule of Gondor as acknowledge that his nephew was next in succession after Anarion.
In other words both sides had valid points to make. Denethor ruled as Steward of the decendants of Anarion, not of Elendil. For all Aragorn could claim the High Kingship he could have just been laughed out of court. The argument would have been on technicalities as far as I can see & in the world of realpolitik such technicalities are just words. Aragorn was not a direct heir & did not have a claim to the Kingship of Gondor & Denethor knew that. Aragorn was playing politics as much as Denethor. His real claim was based on his success in the war against Sauron. He was the closest thing to an 'Heir to the throne', but he wasn't actually one in a real sense. I suspect Pelendur & the Council would have rejected Arvedui's claim if he had invoked his descent from Elendil in the way they rejected his descent from Isildur.
Note, my point was based on 'legality', not moral or ethical 'right'. Legally, Aragorn's claim to the rule of Gondor is desputable, while Denethor's & his heirs is not. Hence Denethor's right to rule by inheritance ('heredity') is greater than Aragorn's.
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