The key piece of evidence in the Diane M assault/rape case was a hair found in her bed with CB's dna on it, wasn't it? Not the hearsay testimony that came from his criminal associates, MS & HeB.
You say 'tactic' and 'clever' as if you see it as defence machinations, FF being artful, scheming? Surely if there are genuine inconsistencies in HeB's testimony, as per those referred to in the DM link, paired with HeB's own apparent recent 'skittishness', then surely FF is just doing the professional - examining the evidence - job he's employed to do for his client?
Sorry, it's just that I don't think the implication that it's a tactic on FF's part is helpful. It just plays into the idea that he's on the back foot and trying to play for time. He's not the one doing that. JMO.