Mahendra Singh Dhoni has only been rested, so don't read much into (Ajinkya) Rahane becoming captain. That's what chief selector Sandeep Patil emphatically told the media after naming the Mumbaikar the India captain for three One-Day Internationals (ODI) and two Twenty20s in Zimbabwe.
Test match is a game of partnerships. There is no restriction of the number of overs; all the batsmen have their own time to score at their will. It is not often we see a one man’s show in a Test inning like in the limited over games.