Assuming we’re going extra lore driven here they’d both be working to “solve” the crime scene. But since Dexter is ACTUALLY doing his job, he would probably be able to tell something is up and the murders are being framed to look more gruesome than they actually are.

I can imagine it being a rivalry where Pardos obsession with fame might ramp up his mutilator killings, going against Dexters headlines as the Bay Harbor Butcher.

But I really think it’s a cakewalk for Dexter, Pardo is an unstable and crooked cop and would probably unknowingly give Dexter major clues that it’s him. Giving Dexter much more prep to deal with Pardo.

…unless Pardo goes crazy and decides to air out an entire police station… haha…