The story is about Luffy inheriting Roger's will and surpassing him. The whole story consists of parallels between Roger and Luffy. But sure, it's about Zoro surpassing Roger.
We officially reached a point in the fandom where people are arguing EOS Zoro > Roger.
Roger - Luffy is a connection of finishing the fight against the World Government and bringing upon a new era. That has nothing to do with Luffy's strength or determining luffy's ranking as a fighter. Luffy will surpass Roger in piracy. That has no bearing on who Luffy is surpassing when it comes to actual power.
I can give you a break down of who are the individuals that Luffy's individual abilities are the most alike (if you want).. the answer certainly isn't Roger.
The notion of EoS Zoro > Roger is only unthinkable to individuals who have Whitebeard & Roger in this God-like tier where only the few chosen one can touch them. For individuals like myself who view Garp/Sengoku/Whitebeard/Shiki/Rayleigh/Roger all on the same realm, as they've been portrayed to be, Zoro surpassing Roger & the other's is only inevitable. And Zoro won't be the only one, the likes of Kidd (if he survives for that long)/Sabo/Smoker/etc will all be surpassing the likes of Roger and such when it comes to individual strength.
I simply don't hold Whitebeard & Roger in a special glass ball tier.