Putting speculation aside, this really doesn’t make sense operationally. Introducing a high-profile third party into an active ransom situation would almost certainly worsen things, not resolve them.
If a perpetrator believed a billionaire / president had become involved, demands would likely escalate, timelines would change, and negotiations could become performative rather than controlled. That is precisely what professional negotiators try to avoid.
It would also expose the Guthrie family to long-term risk; once it’s known that an outside benefactor will step in, you incentivise repeat extortion, hoaxes, and future blackmail. It is one of the main reasons why third-party intervention is discouraged.