My initial reaction this morning was ****.
The more I thought about it though, the more it didn't seem like a total mistake. Ainge is paying for future value, not past accomplishments. Bradley is just 23 and has improved almost every year since he's been in the league. This deal will take him into his prime years. Based on his trajectory, he still has some room for improvement. He might be overpaid in year 1 and maybe year 2 of the deal, but it's not out of the realm of possibilities that he's worth his deal by year 3 and maybe underpaid by year 4. He's already made the 2nd team All NBA Defensive team and shot the 3 pointer at almost 40% last year. Those are pretty solid numbers. And based on what other players like Meeks got in FA, this deal doesnt look as bad. Stephenson will get north of 10 mil+ imo. So maybe it wise wise of Ainge to lock Bradley up before that deal goes through.
And, he's one of our guys. It seems foolish to just not pay someone you drafted and invested 4 years in training/developing to see the player actually make strides and improve every season. It sends a good message to the rest of the team. Work hard, improve, do as your told, and they'll take care of you. I'd rather overpay someone who gets what it means to be a Celtic than some street FA just chasing a payday.