I expect WCS, Towns, and one of Lyles/Booker. Not sure on the Twins. I would assume they go together. I believe Andrew is more NBA ready than Aaron is right now, which is shocking to see me type this after what Aaron did in last years tournament.
Booker could come back and maybe be a top 5 pick and more ready to contribute to an NBA team after another year.
Worst case, I see 6 going. Still would leave Dakari, Lee, Poythress, Ullis, Hawkins, and Willis, hopefully from a championship team. That's a good core. You add stars like Newman and the other guys around them and you've got another championship chasing team.