I read this on MassLive:
If Hayward makes a full recovery before the Celtics' season ends, he can return with no penalty to Boston or the player acquired with the DPE.
So we could do both, sign/trade for a useful player and also get Hayward back at the end of the season? Talk about having your cake and eating it too? I guess we would have to cut someone from the roster to add Hayward in that case but we have dispensable players at the end of the roster.
As for Williams, I get the interest but I would not go for him, for sure not now. No need to rush (we have until March 10). We may suffer an injury or a team we don't suspect may have a fire sale along the way. No need to make an impulse buy for someone like Lou Williams.