I'm going to go out on a limb here and say that Danny would not have hesitated to trade for Cousins had this been the 2007 season. One could say that the 2008 Celtics team was not really a well-mannered team (far from it). I believe Danny would've traded for Cousins that year when he needed anything and everything to happen and Cousins would fitted right in.
The thing about failure or one's journey to success is that the edge is ever sharp and ready, and the needed quality to be a risk-taker is ever present. Once success is attained it produces complacency, which is what we are seeing in Danny's case. He hung his hat on that 2008 championship and relaxed. His job is secured and no demands are made of him. He became (too) methodical, too careful, and it has hurt us more than it has benefited us. One could point to flipping the big three for high draft picks as one of Danny's greatest achievement and it would be but luck had a lot to do with it imo, thanks to the Nets for being one of the worst managed teams in the league.
Outside of the championship, I feel Brad Stevens is Danny's greatest achievement. Trading Perkins (for Jeff Green), his fetish with small guards, passing on big trades, never addressing the center position since Perkins, awful at drafting, overpaying talents that aren't worth it, and then the most recent we are all aware of...
Doing absolutely nothing at the deadline while we had the world in our hands to significantly upgrade this team and become a contender.
Danny has lost IT. I'm going to get a lot of flak for this thread but screw it. The guy needed to be called out.