Uhuru Kenyatta has now no way out, he must act. He has 3 options which have themselves consequences
1. He can do nothing
2. He can uphold his deal with Ruto
3. He can cement his deal with Raila and Moi.
Number one and two are virtually twins. Giving Ruto what he wants and allowing him to take it are one and the same. Can be likened to a woman about to raped. She can do nothing and simply go through the motions or she can "cooperate" and request the ravisher to use a condom thus minimizing her post rape problems. Either way the rapist achieves his wishes and desires and the woman remains the loser.
He can consummate his deal with Raila.
In that event it would mean a full fledged war against Ruto. He must destroy Ruto because he (Ruto) clearly would not accept to be in a polygamous marriage with Raila and Moi forming part of the groupie.
Since he has shown remarkable weakness in dealing with Ruto, he would need to deploy someone else to decimate Ruto.
Note that if he fails to weaken Ruto to a pliable level, he would have lost and the 4 years would be a nightmare where Ruto would be the boss.
A word of caution to Ruto is to go slow and allow Uhuru to pretend to be president. Otherwise he will get help and he will cut him to size. Ruto must always remember that Uhuru is still the president and can do a lot of damage. The state responds to him like a dog responds to its master, however drunk he may be