There is fluidity. There is almost an element of disinterest in what Jubilee does. There was a time they could unravel things in the opposition by appointing their tribesmen into government. For one reason or another, that no longer works. Uhuru could appoint a cabinet made up 100% of Kikuyus (or 0% for that matter) and nobody would think any differently of his government. I think that arises from a legitimacy deficit.
NASA is also facing its own demons. A shaky coalition. Raila has to keep the supporters - many of whom have already more or less given up on him - interested by swearing himself in.