Aren't we assuming that BC would not use the cap space for a UFA (eg. Dragic, Ilyasova) or am I missing something?
I would have to go through a thorough list of NBA salaries to know who is reasonable to go after. But from your list the only one I'd be interested in is Rudy Gay. I highly doubt he is gettable.
I would consider going after Ilyasova, but that wouldn't require a trade. Signing Ersan would also allow us to maintain some level of financial flexibility, which can never be a bad thing for this rebuilding process.
More flexibility if cap space is used before July 1st.