Man, the amount of obnoxious know-it-alls on this thread acting like using hindsight suddenly makes them a genius is quite funny to me.
I'm not just using hindsight. And I'm not a know-it-all either. I admit for example, that I was wrong on feeling bad about trading the #1 pick (Fultz) for #3 (Tatum).
But on-topic to the Walker-signing. Until then Ainge was basically betting on two baskets. Trying to compete now (Irving, Horford, Hayward, Morris, Baynes, Smart, Theis) and betting on the future (Tatum, Brown, Rozier, R.Williams, Ojeleye + lots of incoming picks). When Irving made it clear he was leaving (by going silent) and we couldn't trade for Davis, that was the turning point for me.
I knew our core wasn't good enough to win a championship and that it was time to build around Tatum and Brown. I wanted to sign players (mostly bigs) to complement Tatum and Brown. I was willing to take a step back to make two steps forward in the future (my targets were Randle and Bryant(?)). When the news came that we signed Walker I wasn't thrilled. I understood that it was an opportunistic (or panic) move to comfortably keep the team in the playoffs and keep the pressure from the young guys. It was a bit of waste i.m.o. and I was hoping his contract wouldn't be too much of a burden at the end.
Rozier was a back-up PG and I had no hard feelings against his desire to leave. It was basically a given that he was going to look for a new opportunity elsewhere in the offseason. If we had known that Irving wasn't going to resign whatsoever earlier thrn maybe we could have contemplated about the price at which we would be willing to resign Rozier, but that wasn't an issue at that moment.
For me it hasn't been a huge surprise that Brown and Tatum are All Stars now. Their development has gone even faster perhaps than expected, but Brown having a down year as a 13PPG bench player was fully a result of a the circumstances around the team at that time. I was a believer in Brown and I was happy with his extension from the beginning even though many NBA followers doubted whether he was worthy of that contract.
Just like Brown and Tatum (post-draft), I'm also a firm believer in the potential of Robert Williams. People may call me nuts, but I think he has some special skills. I have him as the X-factor for whether the Celtics can become a perennial contender. Timelord can be better than Capela and become a borderline All Star and maybe that isn't even out of the question. Always Mitchell Robinson as his superior comparison in the media or fora, but I have been saying
that the only thing that's holding back Timelord is playing time to show he's the better player.
Coming back to Walker. I sure hope that his trading value is positive as some posters argue. If there are teams lining up to pick up Walker then our off-season becomes a lot easier. I fear that picks will be needed to get rid of his contract.