Just a few thoughts.....
Marshall wants a new contract, he does not want to be hurt or injured during free agency or RFA. Coach wants to win no matter what. however Coach is also adamant in letting everyone know his position, and this goes back to Cutler, that the NFL is a business and there is "NO Love". Marshall is merely shoving this back into Coaches face to prove that it's in Marshall’s best business interest not to play hurt.
If an organization is going to take hard-line public business stances then it needs to understand the ramifications. All players are independent contractors that must protect their assets, which are their skills/ health. Seeing that their skills depreciate as fast as a company car, I can respect the position to look out for themselves.
In regards to BM, he is an ass, and will never be happy, even with a large contract he will complain about something else slip up off the field. He is a child 99% of the time, however this time around he may be right in not wanting to take the field injured given the current landscape in Denver. Mcd's position is a walking contradiction, he wants players that love the game and embrace team sacrifice more than anything else, kind of like a high school coach, however he plays the business card every chance he gets. This does not work and will never work in the ultra competitive NFL.
In summation, this is why the GM and the coach need to have a true wall between them. A coach cannot be an effective GM. the GM needs to be the bad guy, and the coach needs to have the trust of his players. You cannot have both when your players know the coach is the guy on the other end of the table when it comes to contracts. MCD may be excellent with X & O’s, but he lacks the business and life experience to handle these types of complications. Hopefully the offseason will give him an opportunity to reflect and improve on his business acumen.