Being an alpha isn't all about being physically superior anymore. The world is different. If you can be socially dominant through being smart. Yeah, the big guy over there could easily beat you up, but you know what? If you have 4 other guys who would join you in fighting him because you've made strong relationships with them or they owe you something, who would be the alpha now? Being superior physically does help in being an alpha, but so does being rich. Say the big guy does beat you up; you could afford to get the best lawyer in town to make sure the guy stays out of your territory.