All of this speculation is fun, but as somebody said upthread, there is zero chance Osh moves on from any of his vets that still want to play, let alone Collaros.
I have been thinking about it since last week, and I feel like there is a lot less risk with almost the same amount of potential upside if we tried out a new OC instead. I found the play calling really hit and miss this year, and maybe a coordinator with some fresh ideas could get Zach out of his funk (and utilize him better in the playoffs).