I think that parallels in One Piece are broadly overstated. So I wouldn‘t say Zoro is a Whitebeard parallel.
What I do agree with is that Whitebeard and Zoro have very strong similarities in personality. If you want to call that a parallel, go ahead. But I don’t think Oda is deliberately doing it.
What I think is that Oda, when writing both characters, wants them to epitomise traits that he thinks of as manly. So they share a lot of those traits.
So personality wise, yep, Zoro is closer to Whitebeard than he is to any of the other top tiers. (Although we might find out that a younger Mihawk who was still fighting to be WSS was far more like Zoro than the more mature present day one)
The Whitebeard wouldn’t have left Sanji argument is idiotic as well.
Whitebeard took an absolute hissy fit when Oden left him.
Zoro was pissed off at Sanji deciding to leave them. At that stage, they knew nothing about the potential consequences for Sanji not doing that (Head in the box). It was just Capone showed up, told Sanji he was getting married and didn’t have a choice, and then Vito whispered something to him and he went along with it. Nami said he could have escaped if he wanted to, Sanji had said he’d be back later. That’s why Zoro got angry at this happening when they were already on an unstoppable collision course with Kaido.
However, Zoro then waited outside the room where Pekoms explained things further, heard about what had happened and then was, as Luffy could tell, quite worried. He gave a brief huffy let the idiot go statement, but didn’t cause any further fuss. All he said about it was watch out that Sanji wasn’t being a moron and loving the idea of being married. We’ve seen from the Usopp situation that if he’d still felt strongly about it, he would have made a stand.
One could even argue that acting childishly in the face of a perceived rejection is another similarity between the two.