On paper he gives us the requisite "next star" that book of law says you need to be a contender...
But in my opinion we don't need another "star"... we don't need another 20ppg scorer (BTW AB was averaging 18ppg before the injury) and Butler's traits on defense may be special on other teams but on the Celtics with AB, Smart, Brown and Crowder, I'm not even sure if he would be a top 3 defender on our team.
What we need is simple, a rim-protecting, rebounding big that can switch from 1 - 5. We don't need more offense, which is what "stars" are normally denoted by... which is why Carmelo is a "star". So I would prefer Noel on this team more than Butler, especially if AB comes back in pre-injury form