Reading that WEEI story this morning, it's clear that Ainge screwed the cap by rejecting the trade of Hayward to the Pacers for Turner and McDermott. That was the killer, and ultimately resulted in the situation they are presently in. They did not use that $28M exception they got in the Charlotte deal in a prudent way, getting and then losing Fournier to the Knicks.
Maybe that's the real reason Danny is no longer GM.