I'd prefer to keep both. Erden has proven he can be a legitimate back up center in this league. Even if he's only a 3rd string back up, that is very valuable. He moves his feet very well for a big guy, finishes strong at the rim, plays long and isn't afraid to mix it up at all. Also a decent passer and he will get better at finishing around the rim.
If you told me Perkins and Erden would be my center rotation moving forward, I'd be ok with that cause I think he'll improve more in 1-2 years.
I like Bradley beacause, like Perkins, he brings something that is so rare. True defensive ability at his position. This kid is basically a sophomore in college and he is already, in my opinion one of the most aggressive and talented on ball defenders I've seen. He also has offensive ability, it will just take a few years to develope, maybe we should wait until he's 21 before we cast him off.
Nah, I'd keep both, like others I'd rather trade Quisy and a 1st round pick for Parker. That'as a good deal for Cleveland. They need picks to rebuild and Parker is walking at the end of this year anyway to another team. He's also 35, I'm not giving up Erden or Bradley for that.