They aren’t going after OP they’re going to amass power and wealth like they said and Buggy will Frame it to his fodder as them going after the one piece.
That moment was a very important character moment for Buggy. Where he finally let go of his cowardice and spoke his ambition to his crew. Oda is not about to make it into another joke lol.
Just take off the sand tainted glasses for once and you will see the truth that croc and the CG simply aren't final villains. Not even close lol.