After his solid pre-season, including jacked shooting numbers, it would have to have been tempting to sign Marcus to the extension. But then Marcus goes back to his old shooting self (that's not a knock by the way, Marcus is one of my favorite play-makers, and his mind meld with Theis is at times a thing of scary beauty), but YET AGAIN, Danny is proved right by not extending Marcus, checking the market next year, maintaining flexibility etc...
If someone offers Marcus something insane like a near max, then we will have no option but to go all in on Mr Untradeable.