Note: Josh McDaniels had full control of the Broncos roster, controversial though that was at the time.
Clayton mentions it here. As one of the more sought after candidates at the time, he had plenty of HC possibilities as leverage. He comes from the Belichick/Parcells shop-for-your-groceries school. That was part of the deal.
I don't see McDaniels taking the job in the first place if he didn't have significant input on who the future QB would be, never mind the rest of the personnel. This is a guy who'd been both a quarterbacks coach and offensive coordinator for one of the greatest QBs of all time, and his backup one year.
And you can't say he was responsible for running Cutler out of town, in the same breath that you say he wasn't responsible for the Tebow pick.
BTW, the Broncos traded three picks to get the 25th overall pick (Tebow): a second-round (43rd pick), a third-round (7oth pick) and a fourth-round draft pick (114th pick).