If DWZ can be a good fullback learning from the wing why can't Edwards be a good winger? it's a much easier position to learn and many fullbacks start playing first grade from the wing, writing him off before he has even played a game there is laughable and if your best argument is that Edwards should be fullback because in your hypothetical world Edwards is a shit winger and therefore makes the team overall worse it's pretty poor tbh, if DWZ is a better fullback which I believe he is then he should play there, just because Edwards was offered the job first doesn't mean he should always get the first crack at it either.
These days, the wing position is a lot more specialized than it once was. You've got to be a strong finisher, capable in the air both on offence and defence and be a strong runner of the football. The only aspect of Edwards' game that lends itself to the position is his running game and even then I feel like you're taking away his biggest strength - his agility. Edwards' is usually at his best when he's looking to challenge defenders through the inside, not go around them. In that respect, he's a similar player to Tedesco who similarly struggled to cope on the wing and looked infinitely better at fullback.
I'm not saying he shouldn't be considered at all. Maybe I should have thrown him alongside Malakai Watene-Zelezniak & Tyrone Phillips (still not sure if he'll be around next year) but the point was I don't see him as a long term solution for the aforementioned reasons.
I can also see the argument that the best player should be in the most important position. When he first hit the NRL, I thought we'd talk about Dallin Watene-Zelezniak as if he was the next Greg Inglis or Jarryd Hayne. At 19 he was a natural and it seemed like he had barely scratched the surface of what he was capable of. It's only really been this season that we've been given a taste and I wouldn't have a problem with anybody putting DWZ in their Top 5 Fullbacks this season. Especially not after Saturday's performance against the Roos, he was awe-inspiring. If there was more depth on the wing, I'd be inclined to go with DWZ but as it currently stands I think they'll go with Edwards/DWZ/Mansour at least to start with.