Yeah, we only had two second round picks in 2017 (assuming we swap with Brooklyn) so we really needed that 3rd second pick.
If I am not mistaken, our roster is now still at 15:
Turner, Smart, Pressey
Bradley, Thornton, Douglas-Roberts
Crowder, Young, Prince
Sullinger, Bass, Wallace
Zeller, Olynyk, Randolph
I see no reason to rush into buying anyone out. If we need to for a trade, no problem, we can buy someone out anytime. I also think all of the new players should show up and do their job for the outlandish money they will be making.
Prince might have value to someone in case of an unexpected injury or something. The only argument is to waive someone so we can try out a D-Leaguer. I don't see much point in that. I would rather run with Prince on the off chance that he can generate some actual trade value.