What's not said but underlying, in my opinion, is Doc wanted another go around with KG & PP, before a full rebuild and Danny and Wyc did not. That was the disagreement that made it time for Doc to go.
I can almost guarantee that if Doc had agreed to stay, KG and Paul would have at least started the season with Boston. It doesn't look like the Clips were ever really interested in KG for DeAndre and I don't think Ainge would have been too thrilled with any of the other offers out there. And if the team is playing well with KG and Pierce, I think Danny might have just let them ride this season out and take the cap savings from Paul's deal expiring and KG's likely retirement.
Of course, if the team played as poorly as they did to start this past season, KG and Pierce would absolutely have been traded before the deadline.
Mike