I'm going to check out the XML files tonight.
But I played a game last night with every one of these leaders. Inca boy was #1 the whole game, I was his neighbor, and he never declared war on me. I think that's because his religion crept into my lands.
Bismark, Montezuma, Alexander, Japan, Genghis, Napoleon, and Russia all declared war on me at some point in the game. And, they all declared war on me after 1600 even though I was within reach of both Napoleon and Germany for most of the game.
I think only Inca, Isabella, Caesar, and Cyrus* didn't declare war on me.
*was destroyed by Japan.