Kwani is it rocket science? I don't need to be a Ruto insider. If a high ranking govt official can trust someone with the position of chief of staff in his ofice, then that is like a President appointing one to be comptroller of State house or Head of civil service (current post held by Kinyua).
So it is obvious to me that were Luto to become President, then Mr. Davis Chirchir would occupy either of those positions. But we will never know because Ruto will not be president in 2022.