The theory that Zoro, Sanji, and Usopp will have conquerors goes way back. Zoro was the most obvious and basically a lock to get it. There was zero chance Sanji & Usopp could get it before Zoro got it, so in a sense Zoro’s confirmation opens the gates for the múltiple conquerors theory to come to fruition. It doesn’t mean it’s going to happen but it was the first necessary step to it even being a real possibility. So I’m not sure that’s the Zoro effect really. It’s just that without Zoro getting it the whole concept was dead because he was the most deserving, and now that he has it those ideas can move forward. That is not to say that some Sanji fans don’t want Sanji to get it just because Zoro has it. So for those people I’d say yes it is the Zoro effect. But not all people who think it’s possible fall into that category.