From the OP, 'The number of possible amino acid sequences that would result in a functional Cytochrome C protein molecule has been calculated to be a billion times larger than all the atoms in the known universe'Yes, but the number of possible sequences of the same length that would NOT result in a functional Cytochrome C protein molecule is trillions of times larger than this number. Yockey calculated both numbers.
Evolutionists focus on one and ignore the other far LARGER number.
So much larger that has any evolutionist shown that it’s likely?
If you actually want to understand more about the evolution of the electron transport chain, read 'The Vital Question' by Nick Lane. It answers your question very specifically.
Did he deal with the mathematical problem of obtaining a functional Cytochrome C molecule that Yockey alluded to?