In the first have of the above quote, Joralex informs us that we're trying to build a functional space shuttle and then gives us all the parts (what a nice guy). Then in the second half of the quote he seems to imply that we cannot possibly assemble an actual space shuttle because of its complexity. Ok, first off, we all know that evolution doesn't work that way. Evolution has no goal and cannot predict future novel contingencies, but hear me out. I'm saying that if you give me all the parts needed to assemble a space shuttle and enough time...I will give you back a functioning space shuttle.
Maybe the bigger question is, could we take the parts for the space shuttle and build a car. If we were allowed to cut and bend the metal (ie deletion and mutation) could we build something that resembles something so unique that no one would think that you made it out of space shuttle parts. I think that is what is missing from the IC inference, mutation and cooption can disguise the ancestory of many genes. So what if flagellar proteins are like no other protein, what matters is that they are trascribed from DNA and translated from RNA into an amino acid chain. In this respect, they are like every other protein.