Tilmon is a huge get, but he is not Jabari Parker or Anthony Davis. At the end of the day, I don't think he, his handlers, or his Mom have the leverage to demand Walker or else from JW. This hire is bigger than one recruit.
All of this is true. However there are some competing facts.
1) Tilmon is the overall gem of a great class. The best player at a position with minimal depth.
2) Part of the sell of the job is the great class a coach can inherit. Without Tilmon, the quality of the class sinks considerably. The sell then becomes that much harder.
3) It's in the new coach's and our program's best interest for immediate results, that Walker is retained for Tilmon and potentially smith, as well as future metro area talent. Long term, we lose our connection to that area, there's a chance that Ford and Martin clean up.
Tl:dr, the leverage is not really tied to one single person, but the immediate success of our program under a new coach kinda depends on it, or we get set back a year at least. I should also probably add that the reason you go after a Bennett or Miller is because even if Tilmon does fall through you feel like they can recover from that first year.