I understand your point, however Johnson does not claim to be his own expert witness.
What he does is superb lawyering by using expert witnesses from both sides and arguing only the logic, in simple language, appealing to common sense. He never badgers, he embraces good arguments from either side. He wins very frequently.
Just repeating the same old lies. I guess Francis Crick the discoverer of DNA is not a top-notch biologist?:
"An honest man, armed with all the knowledge available to us now, could only state that in some sense, the origin of life appears at the moment to be almost a miracle, so many are the conditions which would have had to have been satisfied to get it going" (1981, p. 88, emp. added). "
from: Review of US News Article on Evolution.