The quality of change-up bowlers often decides the result of a Test match. If there is no weak link, opposition batters get no respite and eventually succumb.
In Centurion, India's three experienced bowlers - Jasprit Bumrah, Mohammed Siraj and R Ashwin - bowled 69.4 overs for 201 runs and seven wickets. With conditions getting easier for batting than on day one, 201 for 7 is a decent response to being bowled out for 245. However, the two less-experienced bowlers - Shardul Thakur in his 11th Test, and Prasidh Krishna on debut - went for 194 for 2 in 39 overs, which is where the Test was lost no matter how much India's batters are criticised for their second-innings collapse.