If you don't think Bradley is starter material than Johnson could be a much more affordable guy off bench. I don't believe Johnson is starting caliber but it would be nice in this "practice" season to have him start and play with rondo to see how hell do.
It's way to soon to project Chris Johnson as a starter. I see him as a quality rotation guard on the cheap. And that's an absolute bargain for what we're paying him. he also has some room for improvement in his game at age 23. So I hold onto CJ because, no trade value, no pedigree, but a useful bench/rotation player and minimum cap hit.
I'm glad that the Celtics held onto CJ for the rest of the year. As for Bradley, Green, and Bass. Any reasonable offer that gives us good value, I'd move them in a heartbeat. I'm not convinced that Bradley can be that starting 2. I'd rather trade Bradley for value and try to sign a real SG like say Lance Stephenson in the offseason.