I think he is angling for Internal Security. Would be a mistake if he seeks revenge for being imprisoned. I know rich Kenyan guys can forgive some one banging their wife but not being thrown in a cell! Its the reason Moi was determined to let hell rain on Kenya before Matiba could become President. The guy was just too angry with Moi.
Now Koigi and Raila stayed in longer but emerged without bitterness. There is a huge difference.