I think it will be Boris or Raab, Stan. Anyone else, and votes will leach to the Brexit Party. Either one of those has to move to WTO.
If they don't, we're left with the same rotten May Withdrawal Agreement and it won't get through Parliament.
If they do, possibly even doing a deal with Farage, voters will come back and that's when the EU will sit up and start to talk.
As Finglas said in a recent tweet, it's in the EU's interests to get this done. I don't know how many Brexit Party MEP's were going to send to the EU Parliament (find out tomorrow or Monday), but they'll team up with other Eurosceptics and make the Scot Nats in Westminster look like girl guides!