There wasn't even any circumstantial evidence in the case was there, & circumstantial evidence isn't even evidence , according to dave.
If I didn't know that you're being sarcastic, I'd almost agree with you. ;)
I don't have a problem with circumstantial evidence, provided it's thoroughly investigated, cross-referenced, irrelevant / innocent explanations ruled out, and supported by forensics.
In this case, even the little circumstantial evidence that was presented is beyond flimsy.
The shock-horror factor was the presentation of the "reconstitution" video on the last day of the 3-day trial, with no defence investigation into the circumstances leading up to that. I'm not sure what the defence could have done, though, if there was no way of proving whether or not he'd been threatened /beaten / otherwise coerced into doing it: police "interviews" weren't recorded.
The defence had simply assumed (wrongly) that it wouldn't be admissible and that the case would be thrown out. If they had realised (or realised in time) that it was going to be admissible, then they might have changed their minds about advising their clients not to testify in court.