I am always generally pro new blood. Bwana Njoroge kazi kwako.
A PHD from Yale is impressive. I am however not sure WB/IMF actually guarantees good practical experience, this large organisations tend to encourage alot of specialization such that one only gets to master a very narrow field.
I don't envy this guy, the prof had set the bar so high that he will be caught out very quickly if he dares to sleep for more than 5 hours a night.
"The purpose of bureaucracy is to compensate for incompetence and lack of discipline." James Collins