They don't have to do anything specifically for Buggy. They'll be somehow dragged into the mess and whatever they do to clear that mess will end up being credited to Buggy.
There is no “mess” that can have them compete with the Yonko believably.
even the “chillest” Yonko, Shanks has an entire armada, goes around fighting admirals and Law and chasing teach around the new world. Shanks has connects with the Celestial dragons and Roger’s secret dream and knows about the Nika prophecy and has Elbaf, the strongest country, as his allies.
do you see the amount of shit that’s needed for someone to believably reach laugh take through actual effort?
Cross guild was formed like one month ago, and they are reaching laugh tale in like 1 month from now… so they technically only needed TWO FUCKING MONTHS to do the thing ENTIRE YONKO EMPIRE have failed to do for in DECADES… Even Luffy who is playing on Speed mode getting lucky and getting powers up left right and center at least needed the pre time skip, then the time skip, then all of post time skip to finally reach Laugh tale
cross guild started going after one piece 1 month ago and you think they’ll do something on the level of Luffy and Shanks and Teach to reach laugh tale in TWO FUCKING MONTHS?
Do you seriously not see how this break the logic of the story? 1 Yonko level guy, one maybe YC1+ guy and a bunch of fodder can reach Laugh tale in two months just like that? This makes sense to you?