Not at all comparable situations. Zingarevich is the feckless son of an oligarch who seemed to think his dad would fund his plaything. When daddy didn't cough up, he did a runner leaving the club up the creek. Dr X has (whatever the exact details) a holding company that owns many companies in part or outright.
However much he is actually worth, he's provided proof of the funds to buys us to Lerner, the press and imminently to the FA / Premier league. Not sure there's much more he can, or should, do.