I think Smalling's really struggled at RB since his return from injury. His passing is a bit off, he dwells on the ball too long, almost never gets to the by-line and, crucially, isn't even defending very well. The amount of time and space City had over-lapping on our left was the single biggest reason they scored their opening goal. Milner was almost at the edge of our 6 yard box by the time Smalling got close to him.
He's such a cultured central defender, far better reader of the game than Jones IMO. Was head and shoulders better than him throughout the U-21s tournament in the summer and put in a string of brilliant performances for us in the centre last season.
Jones, on the other hand, is more dynamic and direct, more comfortable running with the ball and has a really good cross on him to boot.
It's a mystery to me why Jones isn't playing preferred at full-back and Smalling in the centre.