He was definitely trying too hard. Didn’t play smart. One play in particular if I remember right was in the 4 th quarter on a secondary break he tried to take Lebron to the hole and LBJ stripped him off Jalens knee for a turnover. There was no need for that. If you take Lebron off the dribble and get in paint you kick it back out so there can be a ball reversal for a wide open shot. That’s Celtics basketball , not trying to be a hero , trying to prove your not afraid of the king. It’s one thing if your up against the shot clock but that was early. Jalen needs to understand how to get his shot off and what’s working during the game itself. He struggled with that this series , I mean how many times did Korver block him and stop him. That’s should never happen as much as it did. I think he was still hurt but that’s no excuse. Just shooting the same shots you took all year sometimes doesn’t cut. He needs to think the game more.
Yeah, that was beyond ridiculous in terms of Korver, and I also agree with your assessment that Brown "needs to think the game more". Absolutely.
In general terms, I'd have to say a significant lack of skill, not to mention an absence of intelligence (well, at least on the court, anyway, imo). Dude got exposed last night.
he got exposed as what exactly? He was the leading scorer in the series going into tonight. To me he got exposed as a guy that can get you 20 a night right now in the Conference Finals.
He got exposed in terms of having no midrange game, the inability to use picks/screens insofar as catch and shoot opportunities are concerned, his "ballhandling", and, finally, his penchant for getting stuffed around the basket despite his substantial athletic gifts. Right now, he's a spot-up shooter and a guy who gets to the basket solely on straight line drives, so if you stop him, short, it's like he doesn't know what to do, lol, not to mention who was post game? 
That said, I do like his work ethic and aggressive mentality on both ends, but I still feel as if he's a great athlete who is learning as to how to play the game, if that makes any sense
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Ya like 90% of this just isnt correct. He is actually pretty good coming off screen to the point that the celtics routinely run those plays for him. He was hitting mid range shots at about 50% in the playoffs, he has a decent game pull in up in the 10-16 range off the dribble. The post game was a strength of his all year. He does need to get better with protecting the ball on the drive, but he has some pretty nice dribble moves. He had a bad night, lets not go over board by exagerating the flaws cuz he also had plenty of games like game six where he did literally all the things you just said he can't.
Really, because I only saw that happen once during the entire series, but in looking back at his Game 6 performance, I had honestly forgotten about the two midrange shots that he made, so my mistake, there. Sorry about that one. I guess that after seeing him shoot so many threes and layups that I, well, forgot about those examples, lol.
Idk, maybe it's me, but the guy honestly looks very uncomfortable operating within the midrange area, and if he had been shooting that well from said distance during the postseason, why not opt to take a step or two inside the line, yesterday, and get himself going with an easier shot? I just think that that's weird, to say the least, and his post game, which was such a staple of his, well, game during his rookie year, has seemingly vanished. It's like he somehow deleted all of those moves from his brain or something, lol

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