Yes. Per the TPS press conference, the first thing police did was seize a large amount of video footage. Common sense says you look first at any and all cameras around the home (I recall a very early police comment/ complaint that the Shermans didn't have security cameras. But I bet all their neighbours did).
In the question and answer after the press conference, Brandon Price explained that the suspect is seen, on the night of the murders, on a property adjacent to the Sherman's, going in the direction of the non-video'd Sherman property.
The walker was not recorded by cameras on the other side of the Sherman property, as they would have if they'd walked past the Sherman property.
The walker stayed in this unfilmed zone of the Sherman property for a 'period' of time that coincides with when the murders took place, before he is seen again on the neighbour's camera walking away.
I think this would stand up in court, if supported with other evidence, as circumstantial proof the walker spent that period of time in the Sherman home, murdering them, rather than innocently loitering, on a very cold night, just outside a property where a double murder just happened to be in progress.
I think LE would have identified this footage very quickly. 'Hey Sarge, look at this!' 'That's him, that's our murderer'.
I realize most people are used to people who exaggerate in order to win arguments, whereas LE have to hedge and understate, because their words have real consequences. But IMO, it only takes a little familiarity with police procedure to realize they made this discovery very early on. They just didn't release it to the public for 3 years.
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(There is a transcript).
JMO