I don't think you get it. The party leader is
automatically the PM. MP's don't vote on that. Only change in party leadership changes the PM. If you impeach the PM you go for elections - so it can't be for parochial or corrupt reasons. Donge? Study Israel, UK, Germany, Australia, RSA, name it.
So you see Uhuru only needs to be leader of the registered Handshake coalition. Once he is PM - he can use the power to line up support among those groups you imagine will impeach him. Same as the Handshake now where Ruto is DP with a majority of Jubilee MPs yet can't do anything despite endless matharao.
PM is about accountability - no hiding in State House, explaining and debating publicly and adequately the GoK policies. And separation of power - no assenting/vetoing laws, refusing to swear judges, and abusing deity status to escape scrutiny. In short parliamentary takes away impunity.
PM does not report to the president who is separate head of state - the residual power where mandate rests to avoid vacuum or chaos. All 3 arms of GoK become squarely equal once the state is separated from the Executive.
About influencers and foot soldiers, Ruto's Mt Kenya following is wearing out rapidly. He has zero governors now. 3 or 4 senators - Kihika, Kindiki, Linturi. A place like Kiambu the MCAs firing Waititu and supporting Nyoro indicates Tangatanga lack of influence. Ruto's painstaking clinging onto Uhurutopia or Jubilee unity says alot about his fear of Uhuru influence. Otherwise he would overthrow him in Jubilee with his superior numbers.
As soon as Uhuru 2.0 is formally declared, Ruto will be abandoned heartlessly. Those MPs are unsure about BBI outcome and they are enjoying his handouts. I pity Ruto because he has no control of the wazee. He is at Raila and Uhuru's mercy. There is no magic he can use to beat tried & tested tribalism to beat Uhuru in Mt Kenya. Mlolongo is the biggest blunder of his career.
Most sheeple follow their leader. But also it happens that for a leader to generate critical support he must sell his ideas to those who will sell it. Among latter groups are thinkers and community influencers. If they are hesitant with an idea then the leader may lack necessary support. It's happening to Uhuru. His support team cannot convince people of the merit of what he's doing.
Heri aseme he's supporting Raila/Waiguru ticket but these parliamentary is plainly "selling everyone for him to be PM".
Truly truly check parliamentary numbers and convince me Uhuru is better off! Indeed, Raila can easily screw him since he will not raise enough number of MPs....