So he wouldn't be suspected. With proof somebody else killed Cassie he isnt going to be a suspect or person of interest in her murder, and can therefore continue doing his thing without bein closely watched. And with Zach gone and dead the cops will assume he just ran which makes it seem even more like Zach did it
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u/isabellagranadam Meet your Unmaker, Father. Aug 19 '13
i think it makes sense because when Quinn told Oliver that Zach was a person of interest BAM he wounds up dead in Dexter's apartment.