So Zoro is supposed to become the WSS ever. Can we know his dream is fulfilled after he beats Mihawk? No.
Some might argue the Gorosei are mere politicians who have nothing to do with strength. Then what are these scars doing on these fragile old men?
And how come they are so nonchalant in the presence of an enemy who's supposedly a top 5 character
he's not btw
You can argue he's a snitch and all but that still doesn't explain their cold attitude, two are even giving him their back. They literally don't care.
Ghandi gorosei specifically has been hyped up for wielding a katana, which after Wano you can assume to be the Shodai Kitetsu, one of the 12 supreme blades and the sword that wields the strongest curse.
The only 2 main characters on the path to attain fame & strength are Luffy & Zoro. At one point we thought Luffy has to surpass Roger but then Joyboy happened.
Same can be said about Zoro. Mihawk is merely a stepping stone in the path of godhood Ryuma attained.
Although Oda trolled the viewers by comparing Luffy with Ryuma, that was simply a parrallel concerning his reputation as the guardian of Wano.
In reality we know that Ryuma is connected with Zoro, he's hailed as the god of the blade and eventually marimo should reach this level. Many analogies have already been set in stone, whether it's their pre-ts interaction, their looks or observations made by third parties.
What does Ghandi have to do with this? Well first off his design indicates he's originally from Wano. He's the only gorosei not wearing a suit which is to be expected from a hardcore samurai of legendary status. He doesn't hold the WSS title as it would be absurd for someone of his political status to be involved with mundane fame and titles held by what's pretty much considered plebeians.
We know Ryuma protected Wano from outside invaders but also from Wano nobility too. To be able to reach such an esteemed position in the government, Ghandi must have been Wano royalty in the past. Oda also highlights this by having him comment on the Wano situation.
He's the only possible candidate who can eventually confirm to the reader that Zoro surpassed all swordsmen in history. That will happen by shedding light on Ghandi's past and how at some point he rivalled Ryuma and fought him to a stalemate or something of the sort. In the bigger picture Mihawk is simply his master who helped him reach this point. Right now there shouldn't be a huge gap between the two.
I already made a post on why Mihawk will defeated before reaching Raftel. This leaves Ghandi as Zoro's final swordsman to be defeated. It's not a weird move to sideline Mihawk for Ghandi as the gorosei will eventually be the final villains who have also been hyped for so long.