You can value Newcastle United at 200 trillion with Rafa and 500 trillion without him...or vice versa.
It doesn't mean anyone will pay the price.

Equally the club can be valued at 200 million with or without Rafa...or 300/400 million with or without. It makes no difference.
If someone buys it then the price paid, with or without Rafa will be for the club and their valuation of it which would be accepted if sold, obviously.

New owners could be Sheikh's who might want a Guardiola type manager and not want a Rafa Benitez.
New owners may be a PCP company who decide a Rafa Benitez is their asset and ensure he signs a new contract with promises.

Who knows.
One thing for sure...the club will be bought if there's a buyer...with or without Rafa or Lascelles or anyone else...as long as there's a squad.