If the Broncos don't get a deal done by Monday, then there's a great chance that Elway is not going to go out there and overpay. The Broncos are offering 10-12 millions in the 3 year range. If he hits free agency, some dumb team like the Texans or Rams is going to pay this guy 15-20 million. This is why Peyton hasn't been cut yet. If Brock doesn't sign by Monday, then chances are the Broncos will retain Manning.
Brock 5-2 record is very deceiving. People got to remember that he had great defense to play with, and has two very good receivers to throw to with Demaryius Thomas and Emmanuel Sanders.
If I was Brock I would take 30 million 3 year deal and play with a good team. If he goes to the Texans and Rams and craps out, then his 40 millions deal will be the last big money he ever sees.