Funny thing is that your counter-argument isn't actually relevant to my point. At all. No one said that's how it would stay.
We're discussing what they currently are, and if Rakell is a scoring center, then so is Vermette. It's just that Vermette would be a scoring center who is actually good at being, well, a center. If you just want to start making assumptions, you should probably make that clear initially, because you were passing it off as fact: Rakell is a scoring center. Vermette is not.
The evidence doesn't really support that. In fact, looking at the players Rakell spent the most time with, you could probably conclude that Rakell had more opportunity to put up more points than Vermette, and yet Vermette was still pretty close.
The conclusion I'd come to is that, right now, both players are pretty close in terms of offensive results at center(admittedly, Rakell is the more dynamic talent), but Vermette is much better defensively, and in the face-off circle, which are two important aspects to being a center. The result? Vermette makes more sense as our 3C right now.
There's another advantage to that, which is that putting Rakell on the wing also lowers his D responsibilities, letting him play the more skilled offensive game that suits him. And Vermette, unlike Rakell last season, may be asked to do it without Perry on his wing. Which may have been the case for Rakell if he were the 3C, too. Depending on Carlyle, I wouldn't even be surprised to see Vermette and Rakell become a duo. Vermette at center, and Rakell on his wing is a good place to build a secondary scoring line. Based on what we saw from Carlyle in the past, he'd probably shift things around towards the end of a game the team is losing and he'd bump someone into the top line, with Getzlaf and Perry, temporarily. Rakell would probably be on that short-list.