His first bounty is significantly higher than Law's for defecting from the Shichibukai and helping to defeat another. Helped, because Doflamingo fucked him up pretty effortlessly man to man.
But that's apples to oranges. They're all different opponents. It's even worse if you're comparing feats from almost 30 volumes ago to feats now.
Jack is far more prominent than Sabo... they literally hadn't seen him until Dressrosa so it's not like he'd have a lot to his reputation. They didn't even know Dragon's full name for about ten years despite his relationship to Garp and title as the worst criminal. The revolutionary army works differently from pirates.
But that's apples to oranges. They're all different opponents. It's even worse if you're comparing feats from almost 30 volumes ago to feats now.
Jack is far more prominent than Sabo... they literally hadn't seen him until Dressrosa so it's not like he'd have a lot to his reputation. They didn't even know Dragon's full name for about ten years despite his relationship to Garp and title as the worst criminal. The revolutionary army works differently from pirates.
Its more just likely revolutionaries are weaker than a yonko crew