Bullshyt I was way more emotionally invested in that uncle vs jin fight and the Khan fight... I dont care much for difficulty...
I interpreted it as the final fight between Jin and his uncle intentionally being on the easier side.
The game makes it incredibly clear that it's trying to get across that by shedding the constraints of tradition, Jin has surpassed his uncle as a swordsman, a protector, and a man. The only thing saying that he is supposed to be better than Jin is his ranking within the empire. It wouldn't really make a ton of sense if all of a sudden he was a tougher fight than the central antagonist of the game who you just bodied.
Edit: but looking at who you're going back and forth with, we know that shyt isn't gonna matter.