I am not a lawyer but what did the witnesses that Ruto & Sang called do to help their case...from Morei to Bishop Kosgey they all seemed to build or even help the prosecutor in some way.
Take bishop for instance his testimony was more injurious esp. when he asked for a chance to say 'something'.
Morei ended up confirming the 4 meetings although he clarified they were public and political. raising the question why did ruto not call a kikuyu/Kisii neighbor to affirm Moreis testimony.
chepkwony linked Ruto with Koech (UDM debacle)
I think Kosgey(The MP)might walk just because of his well thought out strategy.
'......to the acknowledgment of the mystery of God, and of the Father, and of Christ; 3 In whom are hid all the treasures of wisdom and knowledge.' Colossians 2:2-3