Every team has holes and question marks, including the defending AFC champs.
WR: Decker is leaving and Welker is one high hit from involuntary retirement; as of this moment they would have Andre Caldwell out wide opposite D Thomas.
RB: Knowshon Moreno is an unrestricted free agent; that leaves Montee Ball (who was benched early for nearly getting Manning decapitated for his inability to pick up the blitz), and Ronnie Hillman (who played his way on to the bench after being handed the starting role).
LG: With Zane Beadles departing to Jacksonville, Denver has nobody here.
OL: Zero depth at both guard and center.
DE: Robert Ayers is a free agent, and Derek Wolfe mysteriously collapsed last November. Shaun Phillips started well last year but he's 33 and really wore down towards the end of the season.
OLB: Von Miller is not expected to be ready to start the season
MLB: Who takes Wesley Woodyard's spot? Paris Lenon?
CB: Chris Harris is coming back from a torn ACL suffered in January. Dominique Rodgers-Cromartie is inconsistent and is a free agent. That leaves Tony Carter as a starter; he should be a #3 CB at best.
PR/KR: Trindon Holiday was not tendered, so that's another position that needs to be replaced.
It's all relative; while things may look dire here, other teams have question marks too. Denver was $27 million under the cap before the day started, but that's going to go very quickly with all those positions that need to be filled.