I don't disagree with him. He's got young players with high upside on that team. He's done a good job amassing some talent there.
What he really needs some veteran pieces, preferably off the bench in a 6th man role and a SG.
Plus, they've lost a lot of close games this year. They're getting better. Also, I know it's easy to make fun of Darko, but he's been playing well this year so I'm not sure why everyone is crapping on him.