Well, Ive cleared since fuushia village to kuro GV and I can't clear any other lvl 5. Its absurd the team investment and of course lots of llb characters..
@Luqash @Michael-lv7ou I'm pretty sure those were the captains needed for older challenges before GV even existed. Every arc had some challenges that required you to clear the last stage with certain condition, One was having Laboon as captain. The one in Baratie required having Johnny and Yosaku for examle and so on. They are just too lazy to change that and it also mean that the GV is just those older Challenges but revisited and recycled