Will Muhyiddin Yassin become the fifth or will he, against all odds, reach the summit to be the seventh prime minister of Malaysia?

The list of DPMs who could have been prime ministers but did not make it for various reasons is an impressive one - Dr Ismail Abdul Rahman, Musa Hitam, Abdul Ghafar Baba, and Anwar Ibrahim.

The ones who succeeded were Abdul Razak, Hussein Onn, Mahathir Mohamad, Abdullah Ahmad Badawi, and Mohd Najib Razak.