I disagree, middle order would be the key for us. We want more stability in SA, so Gambhir and middle order gonna do that. Also Sehwag's role will be very crucial in making some quick runs but it's better not to expect much from him in SA. He can't move his feet.
He gives us a flying start and we put the Saffers under pressure. He doesn't and the rest will just play ultra-defensively. The same middle-order played very defensively against NZL recently,expect them to do the same in RSA as well.
As for Umesh Yadav- like all new fast bowlers, he will tour South Africa to admire the scenic beauty of the country. That is all.