tooextracool
International Coach
I think its crucial to note his ability to swing the ball at a serious pace. SA dont have any such bowler in their attack. Other than Langeveldt(who rarely plays tests anyways), all the rest of their bowlers are by and large seam bowlers and Steyn adds considerable variety to their attack. The reason why he took 4/30 against India for example, was because he was one of the few bowlers who got the ball to swing that day and it was an excellent performance. Not exactly sure why he was dropped after though.Which is precisely why they continue to pick Steyn over Nel - the position vacant is the opening bowling position - one which obviously will be favour bowlers who bowl well with the new ball.
Given the fact that Pollock (or the captain, or even the selectors) seems intent on bowling first change, and the fact that Kallis exists, South Africa don't need another stock change bowler - they need a new ball bowler who can swing it at pace. If Steyn was bowling complete rubbish and it wasn't working, you could make an argument for Pollock taking the new ball and Nel being brought back into the side, but Steyn has performed well and Pollock seems to be more comfortable in the first change role.