Only reason I don't see the alliance happening is because I don't see Oda allowing someone stronger than Luffy in his alliance.Big mom shouldnt even be yonko. Oda just made here a meme character now.
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Its cheap plot device for BMP - strawhat alliance.
Tbh Luffy may never surpass some of these people in strength. His "ability" to make everyone like him is why he's so strong. He might become pirtlate king due to all the help he got. Not because he himself is actually strong
Although I hope Luffy surpasses them even in one on one