Also, talking about Pirate King and strength, why didn't Whitebeard become the pirate king after Roger's death? He was known as the strongest man in the world, and given his devil fruit, he could have bulldozed through any enemy. So, why didn't he become the pirate king?
Simply because he didn't care to go to Raftel or find One Piece. He never cared to do that or to become pirate king. This clearly states that strength doesn't make one a pirate king, especially when no one challenged Usopp saying Luffy can become the king without going up against a Yonkou. Luffy could easily be the strongest and still never be considered the king of pirates just because he didn't get to Raftel or to the end.
Is strength necessary? Definitely because without strength, a powerful opponent like Jack, Blackbeard, or Kizaru can put a stop to the captain's dream of becoming the king. However, to become the king of pirates, the captain must reach Raftel. That's a fact.
Simply because he didn't care to go to Raftel or find One Piece. He never cared to do that or to become pirate king. This clearly states that strength doesn't make one a pirate king, especially when no one challenged Usopp saying Luffy can become the king without going up against a Yonkou. Luffy could easily be the strongest and still never be considered the king of pirates just because he didn't get to Raftel or to the end.
Is strength necessary? Definitely because without strength, a powerful opponent like Jack, Blackbeard, or Kizaru can put a stop to the captain's dream of becoming the king. However, to become the king of pirates, the captain must reach Raftel. That's a fact.