When was the last time he played a full season? 2010? 2009?
Its a gamble , for sure , but I suspect its the type of move KG, Ray Allen and PP "EXPECT" DA to do . IF he wants them ALL IN on another run , then you do what needs to be done to give them that chance.
Like this ...Either "LOAD UP" or "BLOW UP" thats what Da is facing I suspect when he meets with the BIG THREE and wants their opinions.
KG wants to return with a purpose . Not just a fairwell tour.
So if DA does something radical like take AV and trade AB or worse even Rondo , I understand why... he thinks its the best way to get #18.

Would DA rent Dwight Howard for a kings ransom for just the opportunity to make another run with our BiG Three?
If this is DA's mindset ...then nothing is out of the question.
Afterall ..Its his job to put together a team to win Banners for Boston. I guess I might have to think different if I was in his shoes. Riley put togethet one of the most convoluted teams ever to win ( and most ) of us hated it , but it worked. Maybe this is the NEW stategy for winning ( DO WHATS necessaary, not whats popular.