John Elway and it's not even close.
This was a broken team when he took over with:
1. no secondary outside of Champ,
2. no real coaching staff,
3. no OL outside Kuper/Clady,
4. no DL
5. no QB
And in just two offseasons he's turned it into a legit playoff contender.
If only we had John instead of McDouchebag when we had that bounty of EIGHT 1st/2nd round picks in two years.