Aren't you worried that one or the other of them is going to go off the rails at some point? Neither of them exactly have the best track record when it comes to not murdering people. What here could even stop them if that did happen? There has to be some sort of contingency plan.

[Not that Starscream really gives a flying fuck about anyone on this ship aside from himself but hey, making sure the other losers on board are safe is a good way to keep himself safe.]