Now that the Celtics put all their chips in and missed on Kevin Durant (signed a 2-year/$53 million deal with the Warriors), the Celtics' only big move made so far this offseason is Al Horford, a tweener player who's more of a stretch 4 than a legit 5. Now Horford is a nice player, but he most certainly isn't going to be enough to bring Boston back to championship caliber all on his own.
With Durant wimping out and signing with the Warriors, it's almost pointless for the Celtics to empty the bag and trade for the likes of Russell Westbrook (uncommitted and looks to be leaving after next year) or Demarcus Cousins (total head case). The Celtics have some really good players under their control for the next few seasons like Smart, Crowder, Rozier, Brown, etc., so why trade them when it isn't possible to build a team that can beat the super team that is the Golden State Warriors?
Easy answer, you don't.
Now hear me out, if you empty the farm for Russell Westbrook, you lose IT most likely, and then you lose Russ in Free Agency after next season. So sure, you improved your record, maybe won a round or 2 in the playoffs, but you aren't beating Cleveland, and you certainly won't beat Golden State. So what's the point?
If you're Danny Ainge, you hold out until the deadline, assess where you're at, and adjust your team accordingly. Because who knows, a healthy Jae Crowder could become a Draymond Green-type player, Marcus Smart can find his shot and become a really reliable weapon off the bench, Terry Rozier can build on what was a solid showing when he played last season, and Jordan Mickey could become a faster-acting Hassan Whiteside. You really never know. Their assets are young and haven't peaked yet, but you know what you're going to get from IT, AB, and Horford. Just go all in with this team as is and make a move at the deadline if you really think you can make a deep playoff run. Maybe you get a Westbrook, maybe you get a Jimmy Butler. Just don't do it now because the value can be much lower come February.