I'll say this, the task force squeezed as much as they possibly could out this investigation. With no physical evidence to speak of, they used technology to make the best case they could.
Where they really excelled however, is during their repeated questioning of Barry. That was a masterclass in behavioral profiling, and they succeeded in getting out of him incriminating statement after incriminating statement.
There is an unbelievable amount of nuance there, from how they approached him, how evidence was presented, how they prefaced certain remarks and questions, how they responded to what he said, and on and on.
If it will be enough for a jury, I can't say for certain. Man though, it was definitely good enough for me.