The Kyrie trade is a hard one for me to wrap my head around in hindsight.
At the time, I hated it, mostly because I thought Kyrie and IT4 were essentially equal as players. I was wrong on that; IT was completely cooked after his injury.
The trade was: IT, Crowder, Zizic, #1 (Collin Sexton) for Kyrie
None of the outgoing players amounted to much. Crowder remained a rotation player for a few more years, but he was never a core piece. Collin Sexton turned out to be a decent player, but never a difference maker.
In return, we got two seasons of All-Star play, including Kyrie making 2nd Team All-NBA.
At the time, giving up the #7 pick for a perennial All-Star made sense, assuming the team knew that IT4 was finished. Danny's plan thereafter was to add Anthony Davis, which seemed like a good bet. He was hoping for a core of Horford / Davis / Tatum / Hayward / Kyrie (with Brown and Smart likely being traded in the Davis deal).
If Kyrie had kept his head on straight, that could have set up a dynasty. So, it's hard for me to say it was a bad trade based upon the thought process. And, I don't see it as a disaster, because we didn't end up losing any core pieces (and quickly replaced Kyrie with Kemba, who looked like an All-NBA player until getting hurt).
When I think a "disaster" trade, I think more in line with Joe Johnson for Rodney Rogers.