Yes, it’s true that the argument is “difficult”, unless one wishes to discuss the physics of possibility. However, the point with the bacterial motor demands a little introspection. The argument is simple. The bacterial motor is built upon three sections, none of which can function individually as a bacterial motor to carry the building blocks of the DNA string. The question arises then, is how can these integral parts of a bacterial motor come into existence if it integral itself to evolution.
Likewise, in particle physics, it is possible to know that something exists before we have knowledge of it because of its effect upon what we experience. Therefore it must exist. What Christo is referring to is potentials. We have a prime example in Jehovah, or if you wish, the creator, who brought laws into existence to support the intended creation. “Let there be light”, was one such instance. Light limits gravity. That is an offshoot of potential that one would have to be aware of before creating a universe whereby the use of gravity is going to be an essential. It’s a simple analysis of cause and effect. We can conceive these potentials before they exist if you are aware of what you wish to create in the first place. If you wish a more earthy example, think about “damage limitation. It has its drawbacks insofar as creation is concerned, but nonetheless for we mere mortals, it’s a good enough theory in basics.