I 'm probably in the minority where I like our entire roster and hope everyone does well.
Even guys who don't like the roster, even root for us to win.
But there are players in particular I am high on. Smart, Rozier, KO, Sully, Bradley are some of my favs.
Reading this I have to wonder what else your high on.

Isaiah I think is in for a big year but I'm not super high on him mainly because I like defense.
You support Sully and claim to like defense, that is borderline absurd. His foot speed is poor and help defense is pathetic.

Amir and Lee are "blue collar" guys. I think Lee in particular is going to play a huge role but I might be higher on Amir long term.
Agree.
I am not high on Sully and KO. I think they are both capable of playing in the pros, but I think their upside is limited by being slow and not athletic. Both struggle with length and athletic guys. This will be the year where they decide they are players but they will have to earn it. Lee and Amir are not going to lay down for them, neither is Mickey but I think they both have a strong edge over him. Zeller and them are a wash. They both could be good bench players, but one has to wonder if either will be a reliable starters. We have all heard about Sully losing weight, and that looks to be the case, but the video I have seen he is still slow and earthbound and playing against dubious competition. KO is a confidence guy, some games he has it and is great, other games it is like he is a turtle with his head in the sand. It is a critical year for KO and Sully, for Sully it is a contract year. He has shown extremely poor discipline up to present, both in shot selection and his professionalism and taking care of his body. Ainge, took steps to mitigate things if he is not ready in getting Amir and Lee. I think he was right in doing so, but it may be too little too late for Jared. I think he gets a chance, but we will not have to tolerate lazy play this year by him because we can sub him with equally effective or arguably more effective bigs.
Young is a guy who I think it is critical for him to grow as a player. I think Thornton was a wasted pick by us from what I seen in summer league. I think I would have took a flyer on Dakari Johnson or trade up for Pat Connaughton instead of taking this kid. I am still optimistic on Young but not high on him.
Bradley, I think is an accomplished pro. I expect him to produce and play good D. Smart, I hope can take the next step forward. He looked like a man among boys in summer league, which means nothing, but it is better to play well against your peers than not. I have high hopes for Smart. I am happy we got Amir, hope Lee has some left in the tank. I think Zeller is steady but not spectacular. I am not as high, as others, on Crowder, but he is so hard nosed one has to pull for him. I am excited for IT, he can be explosive as a scorer.
I like three of the rookies. I am high on Mickey, but I think he will be buried in the lineup. I think, as I have said, will make practices interesting. I think he will swat some shots in practice but that being said, Oly and Sully will be able to earn PT over him as he is a rookie. I wish I was wrong on this one, as we need some athletic help. Hunter and Rozier, I think will be productive at some point in their careers. They both were the man, for their teams, and that load of responsibility often makes for a good player.
I am very high on CBS, he had our guys playing hard last year and I think in many ways he is our best selling point. Ainge did not add a star, but he made the team better, the best he could I think.