Earlier quoted context omitted.
He is not "factually guilty". The cell tower ping evidence was basically all the "science" the state had against him, and it was the foundation for the constantly evolving and self-contradictory claims of the state's key witness, Jay Wilds. I don't know what Jay's deal is (seems very implausible that he was the murderer), but with the cell tower pings being all but useless for tracking location, then Jay's stories ar…
We can't just disregard Jay's testimony -- he led police to Hae's car. He discusses some inconsistencies here: https://theintercept.com/2014/12/29/exclusive-interview-jay-... Edit: A Reddit comment claims to identify more inconsistencies in the interview: https://www.reddit.com/r/serialpodcast/comments/2xytci/comme...
This means the police already knew about the whereabouts of Hae's car before Jay. This part gets slightly more conspiratorial but the police could have lead Jay to the car instead of the opposite.