Amir and Jose developed under Mitchell, while Demar and ED developed under Triano and Casey. The only first round pick developed (they moved CV before he could) under the Raptors during Colangelo's tenure who has not significantly improved statistically appears to be Bargnani.
If BC is telling coaches how to coach, by all means he should be let go, because he has no right to tell a coach how to coach. Could it be the case? Possibly, but I think if Sam Mitchell was a good coach he would find a job elsewhere as head coach or be considered in the running for a head coaching position, he hasnt. I think its bitter grapes with him.
And on the same note, many players including Bosh werent a fan of his coaching ways and methods.