Queta has emerged as an important piece, a starter, but this is less of a surprise to me than Walsh. Queta to me is still kind of a fringe starter, he would probably be more ideal as a bench player on a top team, but he has shown that he can be affective as the 5th starter on a team that is very much in the mix of things. Queta is 26 so there is some limit on his remaining ceiling. Some additional improvement would not surprise me, but I don't see him making dramatic improvement (which is fine).
Walsh, to me, stands alone in terms of the impact he is making and how much of a surprise it is. In Summer League, he looked like he might not even make the team. His contract has very limited guarantees. I would not have been shocked if he was waived. Now he is playing as a starter and every bit up to the task. He has gone from what I saw as a player who had NBA athleticism but not NBA touch or feel for the game, to suddenly having touch and a feel for the game, just 3 or 4 months later. And at only 21, I suspect there is plenty of remaining ceiling. These last 7 or so games, he has played every bit as well as Holiday did last season, a 3rd or 4th starter level. Defenses will adjust, he may not continue to get the kind of looks other teams have been allowing him to get, so things could reset some, but I believe that for these last 7 games or so, he is the main reason BOS is playing like a top team and not just a 0.500 team.
For the rest, I have my foot on the brake for Minott, he has been a pleasant surprise for sure, but I see some consistency issues with him. Fine for a bench player. There could be some near term ceiling with him, we'll see. I love Gonzalez, but feel patience is the key word with him. I could see a Walsh-like leap from him at some point, but it could be a couple more years. And I don't think Scheierman has much ceiling remaining. He is fine as a deep bench guy who can give you some scoring sometimes, but I don't see much more than that.