Shanks' going to hakiport to Egghead and stop Nusjuro, that's the only way the Strawhats can leave, the man is literally on the escape point. The iron Giant is going to meat Goofy and the 2 giants and stall 3 Gorosei, Mars is busy doing Saturn's job so that leaves the top 7 God King as the only option to temporarily stop Nusjuro.
