One thing to address here though.
We argue whether Aragorn had foresight. But why is it that no-one points out that Gandalf did not? Both Gandalf and Aragorn passed through Moria before.
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"I too once passed the Dimrill Gate," said Aragorn quietly; "but though I also came out again, the memory is very evil. I do not wish to enter Moria a second time."
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It is pretty well-known that Moria had become inhabited by Durin's Bane, though apparently what Durin's Bane is, no-one seemed to have known. Gandalf himself expressed some surprise at seeing the Balrog at the Bridge.
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"A Balrog," muttered Gandalf. "Now I understand." He faltered and leaned heavily on his staff. "What an evil fortune! And I am already weary."
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What had Gandalf expected about the Durin's Bane? Just some Dragon or Werewolf or Vampire bat? Obviously, Gandalf did not intend to perish in Moria, but did he foresee his resurrection later?
Saruman did not foresee Gandalf's flight from Isengard, Sauron did not foresee his defeat by a hobbit. Arguably when we are talking about Evil powers, we can safely say that they became rather stupid. But we are still talking about Maia here. One famous Maia that had "Foresight" is Melian. If prophetic powers runs in the blood of elves, then this is rather queer, isn't it?
I suggest that "Foresight" is a divine gift, not even from the Valar, but the Illuvator, who is omniscient. It did not rule out the possibility that blood and ancestry something to do with it, but that is certainly a very distant possibility.