We don't need to bluff about Sanchez.
I agree, though it's clear Arsenal are going to expect him to force his way out and make himself the villain, so I see some arguing that this could be a bluff to encourage him to do that. I don't think it is though.
Here's what I've heard from a reliable source almost a month ago: Sanchez is the top priority, but we have a (unnamed) backup in case Arsenal simply don't sell. That could be Auba, but it's way too early to be looking at plan B, so I doubt it.