Great minds think alike
I get it though. I don't like the idea of Rocks being a
complete Buggy ripoff but him being a powerscale breaking god is also too much.
I used to read comics and I'd really hate it when writers brought in "teambuster" villains who could casually slap around Herald level characters like Thor, Superman etc without breaking a sweat.
They are often just boring and frequently need blatant plot armor to be beaten.
And they make other characters straight up look bad especially when those characters are hyped for being strong. Especially since comics aren't like anime so hero powerups just get retconned.
A powerful but cunning Rocks would work great for the same reason current BB does; he'd be very strong and a major threat, but he can be matched in power and smarts which makes the tension believable and the character more relatable.
It would be believable, allow Roger, WB and Garp to retain hype and it would limit the Worf Effect stuff to a minimum which is how it should be IMO.
And like you said it would potentially make him more fun and entertaining as a character.