You have to look at who they've played so far as well.
PPG: LAC 9th, Pitt 11th, SF 13th, Denver 25th, Pats are 10th.
YPG: Pitt 6th, LAC 8th, Denver 14th, SF 18th, Pats are 22nd.
Pass-YG: Pitt 2nd, LAC 13th, SF 18th, Denver 20th, Pats are 19th.
Rush-YG: Denver 3rd, SF 5th, LAC 7th, Pitt 28th, Pats are 6th.
They've played teams that have been for this season so far in the top half of offenses in these categories. SF will certainly drop off without JG. Denver certainly isn't great but the Pats haven't done well in Mile High historically either.
I will counter that with KC's offense probably being a bit overrated.
PPG: SF 28th, LAC 27th, Pitt 26th, Denver 17th, Pats 12th
I'm not going to go through the other categories. My main point is I think this game will be a little lower scoring than people think.
KC averages 36.3 and the Pats give up 21.6.
Pats average 26.6 KC gives up 28.8
Averaging those out KC it's 29-27. I think with the Pats offense improving and the difficulty Bill's defenses have had historically against mobile QBs it playout out in the low 30's for each team.
34-31 Pats.