Rigathi Gachagua, Edwin Sifuna and Kalonzo Musyoka. One of these three will be the opposition's presidential flag bearer.
None is likely to deputize another.
In particular, if Kalonzo is asked to settle for the deputy position, serious cracks will begin to emerge within the opposition. I'm rooting for Kalonzo President - Sifuna Deputy, what do you think about the alliance?