I was a bit stuck choosing between the first two ranges.
I feel Sully's talent is worth of a $7.5M - $10M but I don't see him as a future starter here, and that's too much to pay for a long term backup.
So in the end I dropped back to $7.5M, but that is specific to the Celtics and our current situation. If he went to a team that had a need for his skills and where he was worthy of a long term starting role, then I'd give him $10M - $12M probably.
For us, he's just not worth an 8 figure salary IMHO given all of his weaknesses.