He is very dangerous.
He killed Nyeri Gov Gakuru Wahome - so current gov Kahiga would go in and they would loot.
He was capable of killing Ruto to benefit from it and become kenya president.
Ruto is very lucky and has made the right call.
NIS/DCI cannot name him for nothing - the next step is to totally and completely crush him
For as long as he active - he will cause problems. His next course of action is to attempt mungiki/usual instability/incite kikuyus.
Impeachment should just be the start of de-horning him until he run to exile.
I think once the details of what Gachagua did come out, 95% of Kenyans will turn against him. He is one of the most evil people in Kenya. Maybe he colluded with Uhuru and some fringe people, but I don't see his political career blossoming if allegations are true.