>>213106819
he didn't knew he was a serial killer, but he knew Dexter was hiding something really dark (killing, raping, kids etc), Doakes didn't expected Dexter to be Bay Harbor Butcher, Doakes was also a killer(duo to the time in army and he was in a lot of shootings when he was a cop) like Dexter, so game know game type of situation
>>213108814
>as well as many other fucked up individuals being possesed by moloch or some shit, which allowed them to recognize each other's nature to a certain degree.
>iirc it's even mentioned in the show but is explained away as being some sort of hidden sense.
shame they didn't show us that, i guess they wanted to keep realistic as possible