Kip could well have just run his own race in the same way that Rudisha calmly did so with no pacer at London.
I note that Kip like Cruz ran an incredible series of races in a very short period of time. In other words, the 800m guys typically run their best times of all on short rest when they are in great shape, know it, and go for it repeatedly over a period of one to two weeks.
Pacing is one of the most important tests in the sport because the whole point outside of the sprints is that you don't absolutely know in advance at what point you will break down from the pace, so you can take very big risks and die (or get a huge pr) or you can not risk enough. Nothing ventured, nothing gained, and no credit for rashness.