^ maybe because if Luffy didn't care about the Mera-Mera Fruit existance, the whole point of introducing Colosseum and Gladiator battle will be a waste since he won't participate on it
Although I'm kinda hoping Zoro and Kinemon will participate instead of Luffy, since they can settle their problem (regarding shisui) there and whoever wins will give the fruit to Luffy anyway
but well...
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