The answer to your question is that natural selection is NOT random. But we have covered that many many times.
How does differential survival and reproduction, even if not random, solve the mathematical problem of finding even one functional cytochrome c molecule?
You claim “in the case of finding an explanation for the complexity and diversity of life the results are already in. Unguided evolution is a fact.”
So therefore how was one of the functional sequences obtained given the probability issue?
Cytochrome c is just one component of the electron transport chain, so why would a molecule of it be worth anything to be selected ?