I wonder if the civ V makers did something to the diplomacy system like put a positive modifier on warmongering civs (peaceful civs will still get negative modifiers) depending on how well you fought them in a war.
I can definately imagine Tokugawa saying something like:
"You fought us with honor and courage! We respect that. - +2"
And other modifiers depending on how you fought the war like...
Captured more than 5 cities during war or rased 1 city or obliterated a huge ammount of his/her army:
"Why can`t you show some mercy once in a while? - 1"
Never attack an enemy unit in his own borders during war(presuming the AI does attack you in your territory during that war):
"Chicken! Why don`t you just come out and fight?! - 2"
One can only hope but maybe they did.
I can definately imagine Tokugawa saying something like:
"You fought us with honor and courage! We respect that. - +2"
And other modifiers depending on how you fought the war like...
Captured more than 5 cities during war or rased 1 city or obliterated a huge ammount of his/her army:
"Why can`t you show some mercy once in a while? - 1"
Never attack an enemy unit in his own borders during war(presuming the AI does attack you in your territory during that war):
"Chicken! Why don`t you just come out and fight?! - 2"
One can only hope but maybe they did.