Well this goes to show what we said about the Pro to be right. It's obvious an item that isn't on sale on BF will go down the charts as long as everything around has a price cut. Now it has a price cut it's shot back up the charts and the Slim slips down to 2nd. Again this shows that some people want a PS4, either Slim or Pro, and when the Slim was the only PS4 sku on offer it's made that console more attractive than the Pro. Now both have price cuts you can see that Pro is taking some sales away from the Slim.
I didn't expect the Pro to be on sale over the holiday though!