It may not be connected to Pogbas transaction, but that doesn't mean it doesn't have any connection to outgoing sales altogether? We will always look to balance the books with our net spends. It's just that we don't need to sell Pogba to buy Higuain, and moreso because the latter requires an investment of 47m split over two seasons, it can be offset across personnel sales without much risk.
For Pogba, if the player was leaving on his terms, which is more wages or he leaves, then Juve would not have leverage in the negotiations as they do currently. The point being, if they don't get their price, Pogba stays. Which to me doesn't seem like a one way street where the player wants out, because if that was the case, staying wouldn't be an option. Juve have their part to play in this. Hard to see how they don't.