Remember, the principals are all utter garbage who stabbed a man in the back after pretending to be his friend for years or even decades. They're treacherous, shitty scum who know they're treacherous, shitty scum and none of them trust or even like each other, because even they know they're garbage.
They may know that if they don't put up a united front, they're utterly fucked. However, their true nature is such that they'll act like the scorpions they are.
And none of them are at all capable of taking blame for any fault of their own. Everything is always someone else's doing. They're always poor, poor victims. They never brought anything on themselves.
So all it takes is for events to go south even slightly, and they'll be pointing fingers at each other, blaming each other for something one of them did or didn't do, and eagerly throwing each other under the bus.
Remember you stupid motherfuckers, first to make a deal gets the best deal.