1. Sully is undersized at PF because he is average height at best, but has a short wingspan and lacks the ability to get any time of reasonable elevation. There are guys out there at PF who are 6'9" but play bigger because they have above average wingspan (hence they have the reach of a 6'10" or 6'11" guy) or they have impressive leaping ability that allows them to affect shots that a typical 6'9" guy couldn't. Sully does not have those attributes. He tends to struggle against the taller PF's in the game, and hence I classify him as underszied.
2. The abundance of flagrant fouls very much does point to poor attitude on defense. There is a different between a hard playoff foul and a flagrant foul. Flagrant fouls are fouls that are classified by the league as being unsportsmanlike - fouls with with unecessary levels of force (i.e. intentionally throwing elbows, throwing other players to the floor, etc), fouls that present a high risk of injury (such as around the head or neck) or fouls that are outside of the flow of the game (i.e. being physical with another player when the ball isn't even in play yet). This very much indicates a poor and 'thug' like attitude much like Dwight Howard and Dwyane Wade, whom Celtics fans largely hate for exactly these reasons. How many players have been injured as a result of dangrous flagrant fouls that guys like Howard and Wade have committed? Everybody gets the occasional flagrant from time to time by accident just because they were in the wrong place at the wrong time. When you have as many as Sully does this year, it's no accident. The idea of "if I can't stop you from scoring I will take you out of the game" is not a good attitude.
3. You are blaming the mass of bad three point attempts from Sully on coach Stevens. Ok. Where are all the tons of bad threes being thrown up by Olynyk, by Faverani, by Bass, by Humphreys? Okynyk is a big and he's taking threes at times as well, but he's taking a reasonable amount of them and he's making them at a decent rate. Where is your recording of this conversation between Stevens and Sully where he said "I don't care if you have a defender in your face or what the scenario is...I just want you to chuck up threes every chance you get"? Have you seen this down in writing somehwere? I'm sure Stevens is ENCOURAGING Sully to be confident taking threes and not to hessitate if he's left wide open in the right game situation. I'm sure he's not pushing him to fire up bad threes with defenders running at him 10 seconds in to the shot clock. And that's only the start of it - was watching the game the other day and Sully caught the ball, pump faked, had a defender all over him...then he waited for the defender to come back down and tried to do an up-and-under jumpshot from 12-15 feet away. All while Chris Johnson was absolutely wide open at the three point line. Needless to say the shot was a brick. Sully's shot selection is terrible, there is no other way to look at it.
4. Yes, that is evidence of poor attitude. Accoding to Sully's own words, his dad basicaly had to sit him down and tell him to pull his finger out of his butt, stop being lazy, and do something about his attitude. Then after this suddenly he started playing better for about 5-10 games, then went right back to the old self. One of Sully's biggest strong points was supposed to be his attitude and maturity. If he needs to be babied by his dad to convince him to not be lazy, gets suspended for a game for being in the news for domestic violence, and then risks missing games because he's collecting flagrant fouls like they are gold stars...these are all signs of an attitude problem.
5. What you say about Sully is right. He's not a 5 year vet. He is inexperienced. Last season he was a rookie on a playoff team, so lack of playing team was perfectly understandable. This year Sully is supposed to be the second or third best player on the 5th or 6th worst team in the NBA. There is absolutely no justification for lack of playing time except the fact that he is horribly out of condition and cannot stay on the court withoug piling up a ton of fouls. His condition this season looks no better than it did his rookie year, nor has his weight dropped. His tendancy to pick up fouls also hasn't improved since his rookie year. Will he improve these things in the future? Maybe. Has he made an improvement in these two areas yet? No. Can he be depended on to play 35 mins a game? No. What is the point of having a star that cannot stay on the court? That just puts us right back into a 2013 KG situation. The Fact that Sully's conditioning is on par with that of a 37 year old 7 footer is a bit...worrying.