If Denethor hadn't committed suicide

[Inziladun]

Originally Posted by Erendis

But why would he cause controversy by not hiding he was of Numenorian lineage?Whould he have been the first or last offspring of a mixed couple-although since the Kin-strife it might have been a taboo,so many years after that almost none would have been bothered-?Didn't Gondor have merchants?Travelers?How impossible scenario is a wanderer son have wants to serve his ancestors' lands?

It seems to me that all the remaining Dúnedain in Middle-earth were confined to two areas: Eriador and Gondor. If Aragorn had been known to have been of the Dúnedain, where could he reasonably have said that he came from, if not the North? If he claimed to be from 'outside' and was obviously Númeórean by looks, I think that would have raised some questions.
If he claimed anywhere in Gondor as his origin, that claim could have been investigated. I can well see Denethor 'checking Thorongil's references', perhaps with the hope of catching him in a lie.