Young rogue lions have a rough life - no sex, no pride, no offspring. They have to hang out with other rogue males. They have no pride of their own, which makes hunting harder. When they think they have what it takes, they challenge a pride leader. The king of the pride is probably older, stronger, better fed. If the king loses, he will be stripped of his lionesses, and his cubs will be killed and possibly eaten. Who would you put your money on? Who has more to lose?