His ankle apparently hurts quite a bit, but yeah, he is a pocket passer for sure that excels by releasing the ball as quickly as possible so the injury should be less harmful than many other players.
I do not see any problem with your critique of the Broncos. The secondary sometime gives up a lot of free plays and they have not had a good safety in some years.
My main thought after doing some research is that the Chiefs and Broncos are truly polar opposites. With statistics showing the Chiefs as being truly the best defense and the Broncos being truly the best offense. Chiefs get a lot of points of of their D the highest in the league, and a lot of points form their special teams but a really small amount from the offense. IIt is offense that seems like it cannot compete, and on paper it looks like almost things are going for the Broncos as they are at home. That being my belief I have seen statistical models that predict a Chief win so I am no so certain myself.
My stats mostly are here:
http://www.teamrankings.com/nfl/team-stat/total-offense-category
I was watching the local news earlier and they did say Dwayne Bowe would miss the game. Local media was kind of gloating about it. Anyways, Vegas predicted the Broncos the biggest margin against the Jags and it came nowhere near coming true so I am not treating a this game as a certain win as that would be foolish to do for such an accomplished team this year in the Chiefs.