but we Will 100% be seeing a training flashback
You and I both know you don't care about training back stories. We are talking about parentage. And only parentage.
Sanji didn't have a random back story. It was set up from zou that his family drama was going to be important and guess what? It was important so Oda had to give us an explanation for why the drama is important.
So where's the setup in previous arcs of Zoro's backstory? Where have you seen in previous arcs that Zoro's parentage will matter?
What I've seen in previous arcs are three things. And only three things. Zoro wants to cut fire. Shusui was a stolen treasure of Wano. Zoro says he will round up the Wano Samurai.
These three plot points are literally the only thing before Wano started that connected Zoro to Wano. And so which of these do you think is set up for A Zoro back story?
Is cutting fire going to be Zoro lineage super power? Is Shusui being stolen going to be related to Zoro's lineage? Is Rounding up the Samurai also going to require Zoro's lineage?
We're 80 chapters in and would you look at that, two out of three of the plots are already done. Only cutting fire is left. You better pray that cutting fire is a secret roronoa family technique now.
Also I said Franky finding his parents would matter more than Zoro learning his father us dead because FRANKY WOULD CARE. Franky is an emotional guy. There's literally no way he would have no strong feelings about finding his parents forced into servitude under kaido. Whether he was raised by iceberg will not somehowsketch him have no reaction to seeing his birth parents.
On the other hand, you can't even pretend that Zoro will even think say more than three words if they tell him he had a long lost father in Wano. Like why would he care? According to his personality, why would this even affect him?