DuracellEnergizer said:

I wish I had had regular Internet access back when the "Palpatine is a clone of Sidious" thing was making the rounds; it would have be amusing to read what was bound to be blatant hoop-jumping rationalizations (being a fan of the PT at the time, though, I might have bought into it).

The most common rationalization was that the Jedi don't sense anything when they meet with Palpatine. Other rationalizations included Palpatine having blue eyes and starwars.com giving different heights.