Bit of a stretch as couch stain was OTT right from the beginning. He displays many outcome seeking traits of sack and always ignores an accusation he is the sack but answers anything else thrown at him.
His language and phrases are often very similar to sack. Couch stain has been more careful not to slip any more since being called out for these and that immediate behavioral change speaks volumes of guilt in itself.
I can't convince anyone as you have to see it for yourself but as Gil Grissom

from CSI on the case these are my findings thus far.
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