It may pain Celtics fans to lose Williams but Robinson is just that and more. He can catch lobs and he is taller so will be able to get more rebounds. Defensive wise, IMO they are equal. Levert is the Perfect PG imo to replace Kemba. He has been balling towards the end of the season.
Knicks do this because they need a proper PG. Rose is great and all but he is better off the bench now. Williams is the perfect small ball center around Randle, if he doesn't choke in the playoffs next year.
NOTE: THIS ONLY HAPPENS IF PACERS DECIDE TO REBUILD.