Alex Smith was able to throw for 4000 yards, 8 YPA, 26 TDs and 5 Ints in his last season at KC - 104.7 QB rating. That's not far off Wilson's stats for this year (5 TDs more but other stats almost identical). So it's really hard to dissect just how much of Mahomes insane stats come from his ability, and how much from the team surrounding him, because there's no way Alex Smith would have put up those stats playing for us.
I will say that if there IS any QB in the NFL better than Wilson, it's Mahomes, however.
When the team was fully healthy at the start of the season Wilson's stats were just as insane. With Penny and Metcalf making huge strides towards of the season, and the emergence of Hollister after Dissly went down, I'm hopeful that to start next season when Britt returns & maybe we improve at guard and pick up a good third option in the receiving game, then Wilson will be back to his barnstorming best.