I really think one of the main reasons we're not going to re-sign Pietrus is because of Kris Joseph.
There are other valid reasons you could point too; we have Lee, Jet and Bradley at the 2 and we have Pierce and Green at the 3, or that Pietrus just had another knee surgery, etc...
But I think it really comes down to the potential of Kris Joseph and I full expect him to make our roster this year and "possibly contribute.
Here's why, when you compare Pietrus and Joseph:
1. Both are long 6'6" to 6'7" players who could play a little of the 2 or the 3
2. Both have very strong defensive abilities
3. Both have "decent" three point shots
4. Joseph looks to be the better slasher and he seems to have a better all around game
5. Joseph also looks to be the better passer and with his attack the basket mentality he will eventually get to the rim much more often than Pietrus
Joseph is young so it will take him some time - but we have decent depth and can develop him.
I think that overall he is just a better long term "prospect" and if he pans out he will be yet "another" solid young rotation guy that can run with Rondo -
Melo, Sully, Bass, Green, Courtney Lee, Bradley...
I think we save that Bi annual for another big man