I think a lot of people are missing the point of this trade. To me, the goal of the trade was to get rid of Perkins. Danny had his mind made up, likely at the start of the year, that this was the time to trade Perkins.
Reasons below:
1. Perk's value was as high as it ever had been and likely as it ever was going to be. Starting C on a championship team, "missing piece to the Celtcs taking down the Lakers in game 7 last year". His stock had never been higher. In a contract year for a player with all the limitations Perk has, the time to sell was now.
2. Perk was a huge liability on offense. This, I think, was Danny' main motivation for moving Perk. He thought it would be addition by subtraction on the offensive end by having JO or Shaq out there for Perk, with only a minor drop off on the defensive end. At the start of the year Perk got exposed. When he was hurt and Shaq was starting, our offense looked as fluid as ever.
Those were Danny's two main reasons for trading Perk. I think they were both fairly obvious to him long before the trading deadline came around.
There were also a couple other minor positive outcomes from this deal that I'm sure Danny took note of.
1. The impact on Rondo. If Rajon were in a contract year this year I bet this trade doesn't happen. Danny would never risk upsetting his star like that when he knows his star could just bolt at the end of the year. But with Rajon locked up for the next 4 years, Danny saw this as an opportunity for growth for Rajon. It would force to Rondo to deal with some adversity, which he has not had to do much of in his young career.
2. Jeff Green is a stud. If Danny did have his mind made up that he was trading Perk, then it's hard to imagine him landing anyone, in terms of straight value, better than Green.
3. Perk's Injury. After missing most of the year Perk came back and immediately sprained his other knee. With a;l the injuries we've dealt with this year, we could not afford another injury prone big.
4. Perk's contract. Danny knew that Perk's value and stock way outweighed his actual talent and didn't want to pay him accordingly.
Now a couple of reasons why my theory may be nonsense:
1. If Danny had indeed decided to trade Perk at the start of the year he would have shopped him around for different players. it's hard for me to imagine anyone giving up anything of higer value than Jeff Green for Perk, but from everything I've heard and read, it sounds like Danny did't shop Perk around all that much.
#1 reason why this trade could be disastorous:
Danny was relying on Shaq and JO being healthy. If they were, then I would rather have either one of them on the court than Perk. However, if they are not healthy then that is a serious miscalculation by Danny. Perk is a far better replacement for either of those two than anyone else we have.
So in conlusion I guess what Im trying to say is that this deal wasn't about aquiring Jeff Green nor was it about not having to sign Perk in the offseason. What the trade was really about was getting better by not have Perk drag us down on offense and trading him at a time when his value was at it's highest.