My view is that O'Leary will need to win the CPC leadership on the first ballot, otherwise he won't win under the CPC's ranked ballot voting process.  He'll either be first on voters' ballots, or down the list.  Same goes for Leitch (only more people will have O'Leary as their top choice than Leitch).  This will leave an opening for someone agreeable to most voters - O'Toole, Bernier, Raitt, Chong, or Scheer - to win the leadership.