One thing for sure for anyone who wants to win the UMNO elections - Don't imagine it will be business as usual for you will have to deal with Malaysians who have now awakened from a 35-years of sleeping and hoping in vain that their elected leaders will do a good job of managing the nation.
So it is good that more UMNO leaders are throwing their hats into the ring to compete for the top positions.
According to this malaysiakini article Ali Rustam to contest for Umno No 2 post I haven't read much about him except that I remember he made a very public call for the PPP to "get lost" as UMNO did not need the party and he did it at the PPP congress.
It seems that Muhyiddin Yassin may be tempted to go for the top post and with a good running mate it may be workable if he gets the backing of Tengku Razaleigh Hamzah, who can be promised a Cabinet position if MY wins.
TRH may not have enough grass-roots support but can contribute invaluable advice in any Cabinet - so it is better if he does not have to contest.
As UMNO is now weaker in the BN coalition, there is also no guarantee that the Deputy President is automatically the Deputy Prime Minister.