Doc Rivers: If Paul Pierce retires, Clippers would let him join Celtics first

Clippers forward Paul Pierce is mulling retirement, which would mean another franchise icon could leave the NBA this summer - Lakers great Kobe Bryant, Spurs great Tim Duncan and Celtics great Pierce. However, unlike Kobe and Duncan, Pierce left his original team. Personally, I don't think stints with the Nets, Wizards and Clippers do much to diminish [...]