Are we really calling draft misses based on summer league? Not to mention that Zizic didn't play, and could very well have done better than Zubac if he had. It's one thing to say that you really like Zubac and think he'll be a good player, or that you wished we had taken him, but saying that we screwed up by taking Zizic over him makes no sense
I feel totally comfortable pointing out that Zubac is a better player than both Jared Sullenger and Tyler Zeller right now based on his summer league performance as well as his professional career in Europe. He could step in and play 18 minutes a night as a center for the Celtics immediately. This is not even a "risky prediction" since we're going to see him do exactly that for the Lakers this year - they currently believe in him so much that they have no plan B at center.
He's not better than Sully (or likely Zeller) right now. Heck, he's not better than Sully was his rookie season (unfortunately, Sully never played in Summer league due to the lockout and his back injury). He may turn out to be a good player, but you have some seriously overinflated expectations for him. Any 19-year-old rookie that comes into the NBA as a better player than the starting C on a 48 win team would go a [heck] of a lot higher than 33.
Saying that the Lakers have no plan B says more about how bad their GM (who also happens to have taken Zubac... hmmmm...) is than how good of a player Zubac will be
I'm not saying we screwed up by taking Zizic - I'm saying we screwed up by NOT taking Zubac. Try to wrap your head around the idea that we had eight draft picks and had the opportunity to draft multiple impact players THIS YEAR. Since the Celtics made repeated claims of exhaustively scouting the Euro prospects I find it hard to believe that they whiffed that badly on a guy who was one of four Euro centers available and lasted into the second round.
I keep trying to "wrap [my] head around the idea that we had eight draft picks", but my hand can only count up to 5 so I'm just really struggling 
Are you saying that the Cs should have used all 8 picks? The trade with Memphis could be argued one way or the other, but lets not say that it was a horrible trade because Zubac was available until we at least see what that pick turns into (and what Zubac does against NBA players)
Given that we took a couple of Euros in the first round, I think it's safe to say that Danny had a good idea of what level of prospect Zubac is. I'm sorry, but I trust Danny and his scouting team more than you. It's nothing personal (really, it's not), but if Danny didn't think he was worth keeping the 31 and 35 for (not to mention that every GM in the first round passed over him), I'll trust that over some success in the summer league and your view of his career in Europe
If he was some raw prospect who wasn't going to be ready to play a role in the NBA for several years (think Young, Hunter, Mickey, Yabu, Zizic, Bentel, Jackson) I could understand passing on him to avoid having to keep him on the roster, but this a 7'2 260 lbs shot-blocker with a post-game... He's NBA ready right now and has a skillset that people on this board have been clamoring for for ages.
There's not really an excuse available that justifies the Celtics trading their two top second round picks away and missing on a player who would A. Make an NBA impact this year, B. Is 19 and has as much potential to improve as any other 19 year old player. C. Has more trade value today than he did when he was drafted.
I really think you are overrating Zubac to a ridiculous degree. He may very well turn out to be an NBA ready player, or develop into a real star. But acting like it's guaranteed to happen is objectively wrong. Acting like Danny made a big mistake by not drafting him based on a pretty good summer league is a bit premature, too
Furthermore, many people on this board are creaming themselves over the possibility of trading first round picks and prospects for Jahil Okafor who had a similar impact in summer league to Zubac last year.
I know I haven't been "creaming [myself]" over the possibility of trading for Okafor (in fact, I'm against giving up any real assets for him), so I don't see what that has to do with my post, but whatever
You don't honestly think Zubac is on the same level of prospect as Okafor, do you? I'm not a huge Okafor fan, but that's just ridiculous. Yes, they both had good (but not great) summer leagues, but that really means nothing. There's a reason Okafor was a consensus #3 pick (arguably should have gone #2), while Zubac went #33 a year later, and it's not because Kupchak is a genius
Time to take a look back and compare Zubac to other NBA players now that we have a reasonable sample size of NBA minutes.
Zubac Per 36:
Age FG% FT% PTS TRB AST STL BLK PF TO
19 .509 .800 16.0 10.5 1.5 0.6 2.0 3.3 2.0
Jahil Okafor Per 36:
Age FG% FT% PTS TRB AST STL BLK PF TO
21 .513 .622 18.1 7.5 1.6 0.6 1.6 3.7 2.2
Jared Sullenger Per 36:
Age FG% FT% PTS TRB AST STL BLK PF TO
24 .313 .500 11.3 8.2 0.9 1.2 0.3 5.2 1.2
Tyler Zeller Per 36:
Age FG% FT% PTS TRB AST STL BLK PF TO
27 .468 .577 11.9 9.1 2.5 0.5 1.6 3.9 1.2
All these stats are from:
http://www.basketball-reference.comIt's pretty clear to me that Zubac is the best prospect AND player out these 4. Once again, the Celtics opted to pass on Zubac in the second round.