I continue to be surprised that people are kvetching/consternation about Lonnie Walker and Oshae Brissett. I think Craig is better than either of them and he hardly plays, hardly moves the needle. I would be happy with Brissett on a min deal, but you can't even measure the small amount he would move our needle. I see Walker moving the needle even less.
I think where the roster ended up is completely understandable. Craig is a little more useful than either Brissett or Walker. Walsh and Scheierman are less useful but you aren't going to cut them (rookie deals) to make room for Brissett. Tillman is certainly expendable. In hindsight, Brissett would have been more useful than Tillman, probably, but I understand why they signed him. He has been a disappointment, but I understand and probably would have kept Tillman over Brissett too. At the time, he seemed like a better fit.
I doubt any of these guys, Brissett, Walker, Springer, Tillman, would change the outcome of even 1 game, and definitely not in the playoffs.
When your top rotation is pretty much set you have to find less important pieces to worry about 
Yeah, I get it. As I said, I actually was surprised they didn't bring Brissett back. Glad to see he is getting a chance to showcase for next season. He is a very likeable player, works hard, does whatever is asked, whatever is needed. Guys like that are good to have on the team. I think he wanted a bigger role though. I don't think he wanted to come back.
In hindsight, Brissett would have been better than Tillman has been, probably. But keep in mind that Brissett averaged 3.7 pts and shot 27% from 3 for the Celtics last season. He was not that good. Better than Tillman has been so far this season, but that is not saying much.