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they will die if it's Akainu. It's ridiculous that the MC thinks that he can fight an admiral at this point
Probably the one where the Three-eyed tribe resides
The other supernova survived. They won't fight the emperors directly. They have no reason to fight the same enemies as the manga/anime right after entering the NW. although considering that marineford is probably the end thanks to Jaw i have no idea what will happen to the crew.
Haki needs to hit to be effective, he can still use it to avoid attacks. He can also use his own haki against the opponent so it's still useful.
Future sight probably isn't as good as it sounds in direct battle because the fighters would need to make few new plans every second considering their speed. This is the only explanation i can think of. It only predicts one possible future so every change in the battle makes the previous prediction invalid. It's better for avoiding ambush or unexpected situations. Maybe in the future we will see someone capable of predicting all possible futures. Plus if there isn't 5 seconds between the the reset of the prediction and the new attack then you can't really predict it 5 seconds before it happens. IT'S ALSO POSSIBLE FOR LUFFY TO HAVE READJUSTED THE TRAJECTORY AFTER KATAKURI INITIALY PREDICTED THE ATTACK. SIMMILAR TO PYTHON BUT ON A SMALLER SCALE.
Can you share a few of the stories with similar systems that you have read?