My take is that this team has solutions on the roster for every problem it has.
I agree with this at least to the extent of Walker playing with Brown and Tatum. I am not worried about that at all. Walker played fine with them last season. The problems started when his knee wore down. Walker is not playing well period, not relative to how he is playing as part of the team. It is not a given that he will get his game back, but I think more likely than not he will. Then he can worry about fine tuning it to best fit in with Brown, Tatum, and the rest of the team.
I don't agree that we have solutions to EVERY problem though. I don't believe that RWilliams is the solution to our weaknesses with our big rotation. None of our bigs are very good, including RWilliams. I think it is more likely that Thompson gets in better shape and improves some and that will help, but not solve the problem either. We need to pick up someone through a TPE trade or something like that in order to meaningfully upgrade our big rotation or this will continue to be a weakness. To me, this is more than a "nice to have" upgrade. I think it will limit how far we go in the playoffs if we are not able to improve it.
We also have a weakness in that we don't really have a solid vet wing to bring in off the bench. We can likely get by with how we rotate Brown and Tatum (as suggested) but it would help to have a more solid option off the bench than Nesmith (who is improving) or Langford (who may or may not be healthy). Actually Javonte Green has been OK but it would be nice to have a better option. I put this at more nice to have than need to have though. Rotations shorten up in the playoffs anyway. If we have Tatum, Brown, Smart, and Walker all healthy, we can work around this weakness.