The only argument you can make for them is that Kemba will be a better team fit than Kyrie. But from the reports I read Kyrie was the only grownup in the locker room. Guys going out and partying pissed Kyrie off. So we can say Kemba for Kyrie is a wash (being generous here), Kanter for Horford is a big loss, Morris for Langford is a loss since Langford is a rookie and another wing which they have plenty of.