Positionally, I think Cabaye was a bit better, yes. I think he was equally naughty when tackling and whilst he maybe got stuck in a bit more. I don't remember him being particularly effective at it and he was pretty immobile, as well.
I would disagree. Cabaye may not move like Delph but he knew where to be, how to pick up runners etc. he and Tiote for me where excellent defensively in that 4-4-2. To some degree athleticism is over-rated when it comes to defensive midfield play. Busquets is no top athlete but defensively he's superb because he's so intelligent off the ball, always thinking. Cabaye's nowhere near that level obviously but in the PL he's one of the most intelligent CM's. Off the ball it's night and day between him & Shelvey. Shelvey barely looks interested and doesn't look like he knows what to do most of the time when off the ball.
I very much like Shelvey on the ball. Don't want to criticise the lad too much.
This. Shelvey's positioning is almost nonexistent. Even on the ball it is a detriment if the opposition are pressing him in any sort of sense, whereas Cabaye has the knack of finding space to make a pass even when there is very little. However, in terms of finding a replacement for Cabaye (albeit it taking 2 seasons) I think he is as good as anyone to fill his boots.