I won't get into specific deals, but I think players that need to be moved/are redundant are the following:
Avery Bradley - tough to trade this guy because he is a great defender, a professional, and hard working. Unfortunately, he lacks the size, ball handling, and shooting for his position. He seems like he would be better suited on a contender coming off the bench.
Evan Turner - this is more about fit. I don't think he is a fit for what the Celtics want to do. We don't have the shooters yet to compliment his style of play. I also think his value is higher right now than it will be at the end of the season. He was a solid player for us last season. I could see a contender with some shooting coming off the bench with him being a good fit.
Olynyk - this is about redundancy. Although Lee is in his final year, and Amir will only have another year left, I think Olynyk has kind of shown you what he is. He's a solid offensive player that can stretch the floor, and get hot from time to time. I think Sully has a higher ceiling to be an impact player. He could be a really good fit for a team looking for a small ball 4. I think Sully has the potential to be that for us, along with Jerebko and others.