Saruman for or against Sauron?

[Raynor]

Originally Posted by Mansun

Aragorn does not have the great power of Gandalf, even if he has a strong will.

True, but that didn't seem to matter much to Gandalf in the quote above.

Denethor would have been a more realistic thought in the mind of the enemy, given that he was the Lord of Minas Tirith at the time of the war.

However, he was much weakened and affected by his contest with Sauron. I expect that Saruman would find out about that one way or the other - spies, rumors, Sauron himself, the palantir.