[obloquy]

Sauron never knew where the One Ring was save for when Frodo claimed it in Mount Doom.

Then why did he send the Ringwraiths to the Shire? Didn't Sauron perceive the thoughts of his servants when they had the Ring and its bearer pinned down in Bree, on Weathertop, or at the Ford?

Sauron, though powerful, was still limited and "powering up" the Witch-King (or anyone) would probably be a tiring process, possibly taking some time.

Based on what prior example? This is pure speculation and one of those leaps in logic I mentioned.

The Witch-King, being the Dark Lord's most dangerous servant, was probably the best candidate for an increase in might.

Yeah, no doubt. So you're saying that Sauron only had a little to give, and it was really hard for him to do it, so the Witch-King got it all. Sounds like another leap in logic.

Regarding the War of the Ring being all or nothing, Sauron was quite arrogant, with the most notable example of this being his inability to comprehend anyone trying to destroy the One Ring.

You're right, he was arrogant. Your example is an accurate one but what it reveals runs counter to your argument: His arrogance was in his presumption that military might was of primary importance. In this endeavor he put forth all that he was capable of mustering and held back nothing.

All of this is virtually irrelevant anyway since the indisputable fact is that the literal interpretation of the note has not been established.

I don't see how Gandalf being bested by the Witch-King is an insult to his character--he just lost a fight. His character is still intact.

His character--that of demigod in man's form, peer of Sauron--is decidedly not intact in the movie. If the scenario bore any hint of possibility I doubt so many people would be bent out of shape about it.