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I haven't done one of these in months but
Current Luffy and Marineford Jozu
100% health each

Current Luffy has Gear Fourth.

Even if he didn't, I think Luffy after years of intense training with Raleigh would be enough to take down Jozu. His Haki alone would probably be enough.

I don't see them injuring each other, though jozu should be = full strenthg doffy while G4 luffy might be a little less both.