tbh I doubt Oda cares this much about who Gaban parallel with, even Rayleigh and Zoro never exchanged a single world on-screen IIRC.
I'm just curious to see where the number 3 of the Roger Pirates place strenght wise, as I see the Roger Pirates as being the floor of the prime Straw Hats in term of strenght (Prime Luffy > Roger, Prime Zoro > Rayleigh...)