Even if Presti were available:
A. I don't trust that Vivek is competent enough to even think about going after Presti.
B. Even if Vivek shocks us all, and does actually pursue Presti, I don't think Presti is stupid enough to want to deal with such a level of incompetence from his owner.
I think if Presti left OKC, he'd want some form of team ownership or something crazy along those lines