Dean and Tyson may have the highest chance of survival; But imo it's still a bad move cause Dean is the only one among dave friends being able to use the revolver.
Speculation, spoiler:
There is also the possibility the Dean is on Memphis payroll all the time. There are two very subtle hints to that. Would be quite ironic, but also a crazy payoff: The only way for everyone to survive is to follow the Dean-Romance Path A, to make Dean defect from Memphis gang.