As coach of Kosencha, I want to explain he had chicken pox starting one day before Junior Trials (8th of June). He was in the bed for one week, took antibiotics, and could go out of his house two days before the Heats only.
I didn't agree his participation in the heats, but he wanted to try in any way.... and after 600m didn't have energies at all.
So, also if I know Leonard could run under 1'43" pulled by Rudisha if his situation was ok, and I think he can be in short time able looking at a medal in top championships, I also know he doesn't have time for recovering his sickness and moving to his top shape before Olympics. For that reason, I fully agree with the selection of AK.
Of course, we work for running under 1'43" after Olymnpics. In 800m, there is no tactic if Rudisha is in the race : if you want to run fast, you have only to follow longer you can....