I still think Olynyk has a season in him where he'll get starter minutes and average nearly 17 points for some team. MIght never happen in Boston.
I don't think it's always fair to cherry pick a star that was taken later in the draft and say a GM whiffed. By all means, criticize the Wolves for taking both Ricky Rubio and Johnny Flynn right before Steph curry at #7. A lot of people felt that was a bad pick at the time. But can you really just look at that same draft, see future all-star Jeff Teague was taken 19th, and claim every GM blew it by not taking him? Who saw that coming?
I get that Giannis was seen as a raw prospect with lots of potential. He was taken 15th, though. Rudy Gobert was another surprise pick in that draft going 27th. There was no consensus that Giannis would definitely reach his ceiling. He could have easily ended up someone like Perry jones. If you're going to criticize teams for not taking a raw prospect, would you also criticize teams for not taking Perry Jones? Dude went 28th in a draft. Did everyone blow it?
Anyways, Boston had the 16th pick that year and traded up to get Olynyk at #13.
If any team should feel stupid, it's the Dallas Mavericks. They had the #13 pick. They could have just taken Giannis. They could have taken Olynyk. They could have taken Shabazz Muhammad (who went 14th). Instead, the Mavericks trade #13 to Boston for #16.... one pick after Giannis was taken.
But Dallas wasn't done. They could have taken Dennis Shroeder (who went 17th)... instead they draft Lucas Norgueira at #16, then trade down to #18 and end up with Shane Larkin.