How is it golden St can afford to resign all of these guys?
Crudely stated, under the new CBA a team can go over the cap to keep their own players. They cannot to sign free agents. Every big player for GS, save Durant, was drafted by them. Hence, they can sign them as long as they are willing to pay.
This is why ainge is accumulating great draft picks. As these players grow, if they pan out the Celtics can pay to keep them. This is why those posters who whine about "too many picks" are missing the point entirely.