I agree with everything you say about Exum, Nick.
I still like Saric, though.
Bold Prediction:
Dario Saric has a better NBA career than Dante Exum.
Saric is a guy I get more and more intrigued by every day. Since about Jan/Feb my preference for anyone beyond the top 4 has been Vonleh, but I'm becoming more and more convinced that whoever gets Saric is going to be getting a player closer to the Manu, Pau, Parker type of international prospect and not the Tskitishvili, Korolev, Vasquez type.
Unlike Exum, who there is limited exposure to, there is plenty of tape on Saric. He already has accomplished a lot at the international level that many other Int'l NBA prospects typically have not, and it seems like the debate with Saric is mainly about WHEN he'll play in the NBA, not CAN he play in the NBA.
In particular, if there is a scenario where the C's drop down a few spots, pickup other assets, and draft Saric - I wouldn't hate it at all.
Even if he stays overseas 1 more year, that'd be one less developmental year the C's would have to pay for on his rookie contract (though I'd really hope for him to come over immediately).