I would have loved AD, but seeing how the Kyrie experience is going post-Cleveland I'm still not as convinced the C's could have won Banner 18 with AD-Kyrie also when you consider they'd have to deal some pieces to acquire AD as well.
Kyrie was the main problem here and it might have continued even if AD came here.
I mean look at the Nets. A supposed super team that didn't make the ECF last season, and then one of their Big 3 bolts because of Kyrie (not the only reason, but a main one) and I'd argue Kyrie's lack of availability has hurt them in crucial stretches especially with KD out.