It's a mark of how much Maverick and Pops’s relationship has changed that Maverick feels at all comfortable telling Pops he wants out of the gang. This shows Maverick is, as Pops has said before, becoming his own man. And importantly, Pops makes it clear that growing up and becoming an adult means realizing that choices like this always exist. It’s brave, Pops insists, to be willing to make them—and most men don’t. Finally, Pops’s suggestion that Maverick should be called Big Mav signals that Maverick’s process of growing up is complete. Now, he has his own identity, separate from Pops’s.