Do we know for a fact that it was Zachary who actually made the text to his cousins from his phone?
If he was making a call only, the restroom would have made more sense considering the weather out this way... cigarette break, maybe, but even then, couple minutes is all you need, (or would likely want, as you hand would be starting to freeze!).
My first though was maybe he was hooking up to buy some weed, (or whatever), as he seems to be looking up the street, almost like he's waiting for a ride...quick spin around the block to make a buy... No mention of who he called, (if he stepped out to use his phone), make was made by those he was with.
I am only seeing stills in the video footage, I wonder if it shows him walking off camera...
There's something that's not adding up here, to me...
So he didn't text his cousins, that he couldn't get back inside... I wish they just showed the darn text!
My Hinkey meter is saying something is missing from the account of his going outside, that is being given...
The bar: "It said other video shows that Zachary was seen heading toward the surface artery". That's in the direction of the Boston Harbor though I can't see why he would walk 6 blocks to the water if he was waiting for his cousins. Was he that rattled by the thought of cleaning out his grandmothers apartment that he would disappear? I'm starting to lean in the direction of foul play here though Faneuil Hall would have lots of witnesses even at 2am in February.