We don't truly know any of this. You're guessing. I find it odd that they would keep a GM around with no power and allow him to do the 2018 sell off. But my point is that we do know that DD was permitted to explore trades for Britton in 2017. And the trade he had on the table was terrible but was nixed by PA. So it's not a given that if DD would've sold off earlier, the deals would've been better.
Zero chance either of them would have allowed DD trade those guys. They both had more power, especially after the Duq/Toronto thing.
Maybe Duq didn’t want to move them either, who knows but if he did, they wouldn’t have let him.