This is Pearl, Gin, and Don Krieg vs. Hatchan, Kuroobi, Chew, and Arlong. Going underwater and using MH5 is prohibited. The last man standing will win it for their team. Who wins?
Pearl would go down instantly, so then it would be a 2 on 4. Gin put up a good fight against Sanji, but I doubt he would be able to take on 2 of the fishmen at once. I could see the fight being Gin vs Kuroobi, and Don Krieg vs Hatchan, Chew, and Arlong. With that said, I think the Arlong Pirates would win.
Yeah, they'd need all of the fighters that Mihawk slayed for sure. Even then I doubt they'd have anything that could damage Arlong. Weakened Zoro's swords couldn't even break his nose.