I dont understand what danny truly wants to do. If he wants to make this celtics team a dynasty , its better to give up your young talent for vets, sign guys like posey(make up the luxury tax in the playoffs) or trade one or two of the big three or all of them and rebuild new. You never saw the spurs in the early 2000s do this nor detroit. Even the bulls always had proven vets in their journey to winning 6 in 8 years.
well, The Spurs only won in '99 with Robinson and Duncan, then the Lakers ran off three straight. Let's look at '03 and '05:
'03
Bowen
Claxton
Duncan
Ferry
Ginobli
S. Jackson
Kerr
T Parker
Robinson
Malik Rose
S Smith
Willis
'05
Barry
Bowen
D. Brown
Duncan
Ginobli
Horry
Massenburg
Nazr Mohammed
Nasterovic
G. Robinson
T Parker
Udrich
Now, how similar are those rosters? The core starters are the same, well, Robinson retired, but the role players changed drastically. Players get value and switch teams to get payed, retire, get traded, etc. Given the salary cap in the NBA you can't just have the same team every year. You try and keep your core together, draft well, and find role players that fit in and replace what you have lost.
By not signing Posey to a contract that would prove to be problematic in the future (to sign other players, etc) the Celtics did not just decide to rebuild. They decided that overpaying for Posey would hurt the chances of being a winning team for years to come. His contract would indeed make it more difficult to sign vet free agents in the next few years.