Honestly they shoukd bring at least an admiral, most likely nope, the SSG or some other serious stuff otherwise, if it is just Rob Lucci with few other CP0 members and fodder it is even questionable if they can reach the waterfall aka beat Smoothie and friends, let aline deal with possible wild cards like BM, the roof 5, Marco, Sanji, other supernovas and so on. Maybe Oda is planning on make the war even bigger (marines and maybe another yonko?)