I’ve seen people say that as fact for a bit now, not sure where it came from.
It’s not a strict rule it’s just an observation.

Ben Beckman is probably the strongest OG right hand and he’d be below Shanks who’s at 4, so at max Beckman would be 3B range.

Mihawk is 3B range despite being a top tier.

Kuzan is also 3B range almost certainly.

Roger was at 5B so in theory Rayleigh and Gaban could be 4B range, however we have seen the bounties of of subordinates for other 5B characters (Whitebeard and Sakazuki) and even for the top tier subordinates (admirals) they don’t go above 3B.
 
It’s not a strict rule it’s just an observation.

Ben Beckman is probably the strongest OG right hand and he’d be below Shanks who’s at 4, so at max Beckman would be 3B range.

Mihawk is 3B range despite being a top tier.

Kuzan is also 3B range certainly.

Roger was at 5B so in theory Rayleigh and Gaban could be 4B range, however we have seen the bounties of of subordinates for other 5B characters (Whitebeard and Sakazuki) and even for the top tier subordinates (admirals) they don’t go above 3B.
No character you mentioned has the same level of influence as the Pirate King. Let alone no subordinate to date has the same legendary status as Rayleigh and Gaban. We’re shown that directly with how the Marines treats Ray vs how they treat Mihawk.

Gaban and Rayleigh aren’t like normal subordinates.
 
No character you mentioned has the same level of influence as the Pirate King. Let alone no subordinate to date has the same legendary status as Rayleigh and Gaban. We’re shown that directly with how the Marines treats Ray vs how they treat Mihawk.

Gaban and Rayleigh aren’t like normal subordinates.
I mean we also have a lot of subtle confirmation that Shanks is over Rayleigh and Shanks is just barely 4B

Rayleigh could have more status that’s boosts him but again it remains to be seen
 
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