User blog comment:AYET/Weak willed people in NW/@comment-4899461-20130207040314

The New World is a place for dreamers. Unfortunately, many of the people who go there do not have the power to make their dreams come true there. It is as Jinbe said, most Pirates that enter the New World usually ally themselves with one of the Yonko in order to survive. There seems to be an abundance of low-level pirates that just want to survive in the New World, and it seems that the Yonko (or other groups/organizations) are willing to take many of them in. It sounds from Law's description in this week's chapter that the crews of the Yonko are so large that they are almost personal armies to the Yonko. In the case of Kaido, I would theorize that he wants a large crew for power purposes. In the case of Whitebeard, it seems like he wanted such a large crew to have a large "family". Who knows about Big Mom, Blackbeard, or Shanks, as they haven't been known to have other crews underneath them (besides the Sun Pirates).

However, in the case of the G-5 Marines, I think they are just kind of weak-willed though... They seem to really just be a bunch of misfits that don't have much self confidence. And if their wills were strong, they probably wouldn't have called Sanji, a pirate, "big bro", or been so sad when they left the Straw Hats.