Gandalf, Moria, and Arrest

[Morthoron]

Originally Posted by Moonraker

Only an opinion.

One without foundation, particularly since Tolkien did not subsequently edit or offer another later version of the sequence. Since there is no alternate storyline, the idea that Tolkien was wrong in what he wrote is inane; in any case, the author is never wrong, even if he changes his mind. The story is his to alter.

Originally Posted by Moonraker

But if he was right in allowing Aragorn the ability to express such accurate foresight, I would want to know how it was possible.

Foresight, providence and prescience are hallmarks of the books. The foretelling of dooms runs from the early 1st Age through the end of the 3rd Age, from the Dooms of Mandos all the way to Saruman's curse of Frodo. I suggest you read further.