My understanding is Stevens would have no issue playing two point guards at the same time, so I don't think Exum is mutually exclusive with Rondo. Exum might make the departure of Bradley more likely than anything else, but you could also split 96 minutes pretty well between the three of them.
I also don't think the C's would take Exum #1 overall, for those bemoaning the neglect of Embiid or Parker. The C's are not currently favored for a top 3 pick, so it'd behoove Danny to know what the other options are.