For me, the announcement by Kavanagh that there may not be a third suspect further calls into question his judgment. He assured everyone on May 21. there was no danger to the public and now, two weeks later, he is telling us that the investigation has not yet established the setting and the actors in the crime. So if he is not sure now that there was a third suspect (it was always a "suspect"), how could he have been sure before MS arrest this person (of whose existence he seemed to have been certain then) posed no danger to the public ? Does this makes sense to you ?
Not only did the lead investigator evidently jumped the gun by giving assurances, but - and that is perhaps much worse - he may have thrown a wrench into his own investigation by insisting that the 3rd person was a suspect in the case, when in fact - if this person even exists - he (she ?) may well have been an unwitting accessory. How much smarter it would have been for the investigators to call the putative 3rd person a POI, and sound as reassuring as possible that they did not believe he was involved in the conspiracy to murder TB. Now of course, if this person was involved in the murder, they would have not gotten a phone call, but if he was not materially involved beyond driving, he may well have decide to take the risk and give himself in. There was nothing to lose and much to gain by soft-treading the 3rd person's role or witness in the slaying.
Best,
J.