Post SuperBowl win, the biggest void to fill was a decent QB! (yes the o-line has been dismal too, but that's been a problem for awhile now [re: Joe Thomas trade collapse]). 
That ship has long sailed, followed by bust drafts, and horrible moves on past and present coaching staff. Now it's uninspired defense, feeding off a decimated lame duck offense. 
As great as Elway was as a PLAYER in Denver, as a GM he hasn't made any big moves since Manning/Ware/Talib/Ward. 
Sorry Johnny, you got too cheap and a little bit of your ego got in the way this time around. The season was a write off the moment you told us you believed in the QB's we had here, when everyone else on the planet 🌎 was telling you otherwise!