Honestly, I wouldn't be too fussed either way. Yeah, Reuben has been Dante's voice (and his mocap actor) more than any other up to this point, but if for some reason he opted out of it or they chose someone else, it really wouldn't be the end of the world for me. Don't get me wrong, I like Reuben in all of his wacky, alien-obsessed glory, but I'm also open to the torch being passed. After all, actors have other aspirations, and no matter how much fun they have while doing a certain project or how grateful for the opportunity, they'll need to move on to other things eventually.
That said, a face model is still not the same as a mocap or VA. It could just be as simple as this guy having good facial structure, and them wanting to utilize that and only that.