My assessment as an unbiased onlooker....
There are a lot more things that San Fran needs to do in order to win this game so I think you're right on that. I disagree with you on a few things.
First, The WR assessment is a strong advantage in KC's favor, especially when considering D Williams out of the backfield. When Sammy Watkins is the 4th option, and your 5th option runs a 4.3/ 40, that is frightening.
I would also argue that while San Fran's defense is better, I don't believe they have a strong edge in this particular matchup. The 9ers secondary is very vulnerable with the Chiefs speed at WR. The KC offensive line is ranked 4th in Pass protection this season so I don't see them being bullied by the 9ers d-line like we've seen. On the flip side, the 9ers o-line is ranked 15th in Pass pro, so the defensive line of KC could certainly swing the defensive battle a bit towards KC. KC's defense is greatly improved over the second half of the season. Honey Badger has been an absolute force, So again, I agree, overall, 9ers Def ha the edge BUT to me, in this particular matchup, its a slight edge.
I also don't agree that the coaching edge is with San Fran. Lets not forget who designed the defense that shut down the 18-0 Patriots in 2007. Spags has a lot more weapons on this defense than he did back then. Chris Jones is a run stopping force and he came out of last weeks game without aggravation of his injury. 2 more weeks off will work wonders for him. Andy Reid is an absolute force coming off a bye week (17-3). People will argue he has had some late game management issues, that's somewhat fair but overblown in my opinion. If we are going to knock him for that, lets not forget who the OC was for the Falcons in that utter collapse vs NE a few years ago.
Ultimately this should be a classic game.
QB: Strong edge KCC
RB: Strong edge SF
WR: Strong edge KCC
TE: Very slight edge to SF for Kittle's blocking (rec is a push)
ST: Edge KCC
Defense: Edge SF
Coaching: Edge KC