He needs to work on sustaining drives as he struggled when Texas Tech and Kansas State took away the deep part of the field.
While I agree with this assessment, you have to take into consideration that Geno was playing from behind a LOT of time due to the terrible defense. He relied on the deep ball to get his team back into games quickly. TTech and Kstate game planned against this and that is why they got stomped.
Also, with Charles in the backfield and a good Chiefs running game, defenses are going to have to prepare for the run. Either Smith is going to eat up a defense with the deep pass, or Charles is in the run game. There will be no more stacking of the box.