they need to refer back to the scouting reports that existed then. ainge played it safe.
this is the part that bothers me. if the Cs were reading the same scouting reports as you and me, they completely failed to do their job. they failed to properly scout Gobert. they failed to properly scout Schroder. and yes, they failed to properly scout Giannis. keep in mind that Ryan McD (who did much of their foreign scouting) was named GM of the Suns a couple months before this draft.
so in turn, calling KO a good pick is an oxymoron.
Scouting Gobert, or Giannis, or Schroeder more would not have changed the scouting reports much. They all had massive red flags that made them risky picks. They weren't any more or less superior as prospects than someone like Karasev, they just happened to have done what they needed to do in order to live up to their potential instead of busting out. You can scout an international or college prospect as well and as thoroughly as you want, but it doesn't eliminate the risk, or tell you if they're gonna work out. The Bucks, Hawks, and Jazz didn't do vastly superior scouting to lead them to picking Giannis, or Schroeder, or Gobert as sure things, they just decided to take flyers on them, and they worked. Similarly, the Cavs and Toronto didn't have some inferior scouting to everyone else, that led them to thinking Karasev or Nogueria would be stars - they just weighed the risks, and took a chance on those guys. The only real difference between them and the Bucks, Hawks, and Jazz are that their picks didn't work out (obviously, some teams have better or worse college and international scouting, but it isn't a massive difference that leads to picking or not picking - it's whether or not they decide to take the risk. The scouts are giving reports with strengths and weaknesses, plus personal opinions, but they don't actually know how good they'll be)
Edit: you added this
playing it safe is a cop out... it basically means Ainge was deeply familiar with Kelly and didn't wanna whiff on someone he hadn't spent enough time on to fully trust.
Not taking a chance on a player doesn't necessarily mean you didn't scout him enough to be familiar - it means you didn't feel comfortable with that risk. I doubt that the Bucks' GM "fully trust[ed]" the Giannis pick, but he took a risk on it. I'm sure the Cav's GM "trusted" the Sergey Karasev pick just as much as the Bucks' GM trusted the Giannis pick. Taking more time to scout the pick wouldn't have revealed any big secrets that told you their future, it's a risk either way. Ainge took the player that he knew would be a rotation player over a guy that nobody, not even the GM that drafted him, knew would be a great player instead of a total bust.