Interesting comments from Romo and it does shed some light on why teams make a change.
In regards to Alexander, a lot of people seem to think the run game will take a nose dive with him coming on board.
Well, you look at the Bengals history of OCs. Nobody was complaining when it was Jay Gruden running their offense. Then it was Hue Jackson, followed by Ken Zampese (fired) and finally Bill Lazor.
If what Romo states here applies to all teams, that could shed some light on why he elected to depart.