Because the issue of how he subdued her so quickly and so quietly is puzzling, and of interest. Given what we know about him, would we expect WC to follow the rules, though? He may have procured an unauthorised taser. But length of unconsciousness wouldn't necessarily be any more guaranteed; and the risk of DNA evidence (blood spatter etc) would be higher. I think that was pretty much discredited given that it wasn't the right kind/colour of car, and the timings were wrong, I think. Yes, this is very plausible - the issue of how/when he subdued her still remains, of course. Perhaps we'll know when the sentencing hearing opens.