There's flawed logic in your buy-out scenario, spyder.
Top attorneys would not advise REVO to withdraw the pressure of an infringement suit before Protect America enters a legally binding arrangement to proceed with the (supposed) buy-out offer.
It is illogical for REVO to file for voluntary dismissal if Protect America has simply said, "OK, we're infringing, but instead of admitting that to the court we'll buy-out REVO. HOWEVER, as we have no finance in place, and have done no due diligence, we cannot enter any legally binding agreement to conclude the buy-out."
It's far more likely, in that scenario, that REVO would have said, "Let's establish some worth in the patent, first, by an admission of infringement. Then we can enter a Letter of Intent setting out the $1bn - $2bn buy-out agreement."
That way REVO has a successful infringement claim on the record, and can proceed with its damages claim if Protect America doesn't proceed with the buyout.
