Knicks pretty much have to move Randle to create the salary cap flexibility they need to fill out the roster, as well as to have a functional offense (not enough basketballs for everyone with him there).
They also need to re-sign either Hartenstein or Robinson (probably not both) and then find a backup center for whichever one they keep.
So you wind up with a starting 5 of: Brunson, Bridges, Anunoby, Hartenstein/Robinson, Hart/DeVincenzo
And a bench of McBride, Hart/DeVincenzo, Sims, another backup center (Achiuwa? (ugh)), whoever you get back (if anyone) for Randle, and a couple of draft picks.
That bench is pretty weak, so hopefully the Randle salary dump brings back a contributor to add to McBride, the backup center, and whichever of Hart and DeVincenzo doesn't start.
And then that is a team that can give Boston a real run for their money - lots of defense, will ugly it up which Boston hates, and lots of shooting.