Lol @ OP suggesting there would be jealousy for how Exum was handled as a rookie v how Mitchell was.
First of all, Exum and Mitchell played well together over SL. If anything, Mitchell drawing more attention from opposing D's will help Exum more than hurt him.
Second, assuming that Exum will sign elsewhere over jealousy about a perceived difference in how DM has been treated as a rookie is completely delusional. He will do what is best for his career at that point, end of story. He isn't going to hold some grudge from years before and let that dictate his future. Only an unreasonable, illogical person would do that (possibly the OP?).