I don't, and, when it comes to what people's motivations are, none of us can really know. I'm making my guess on what's occuring, based on my interpretation of the events.
I think Mario is the most likely person to negotiate a Plan B. He wants the team in Pittsburgh, and, I think he has realized, that if he sells the team to anyone, there's a very good chance that despite paying lip service to the contrary, they can enter a Plan B negotiations with no intention of actually staying in Pittsburgh. When talks break off, they'll move it to whatever location they originally had in mind.
But, I do believe that Mario is strongly considering moving. He's not excited about it, but, I suspect that there is a feeling that he can't protect the team forever. He's never wanted to be an owner, but, his loyalty to the team has always been high, and he's made the sacrifices to keep the team there. But, the second that he hands it off to someone else, that whoever that person is, will just turn around and try to move it anyways. With all that has gone on, I have to imagine that the cynicism is probably growing in Mario regarding potential owners.
For the record, and to get me back in the good books of Pittsburgh fans, who I'm spending a lot of time disagreeing with, despite having nothing but sympathy for in this situation, the scenario that I'd most like to see is Mario decide that he's okay being the primary owner of the team, negotiates a solid Plan B, and retains the team for the next 25 years, where he sells it to a certain young man who is looking to invest the millions of dollars that he's made in his hockey playing career in Pittsburgh.