Listen to Denver Talk Radio and you will hear exactly what I said.  And that information comes from ex-players such as Alfred Williams, Stokley and media people that have inside information into the Broncos.  
It was widely reported that Elway wanted Kubiak to play Lynch in the final game last year.  Elway also wanted Kubiak to fire some of his assistant coaches.  Kubiak was not going to do that.  And so he offered to resign (with his health being used as an excuse).  
Any GM (and that includes Elway) will give every opportunity for their draft picks (and especially first round picks) to succeed.  Nothing wrong with that.  Elway held on to Montee Ball as long as he could.  Even though he had bust written all over him.  Ex-players have even commented how Montee would come to practices drunk (or hung over).  Players knew it and coaches knew it.  But Ball was part of the team because Elway did not want to give up on a 2nd round pick.
The pattern is now repeating with Lynch.