Theory on Gio's true identity
Okay, I did a search and nothing like this came up as far as I know. So, this is not a repeat post.
I have a theory that Gio is Brian.
My evidence:
In Dexter, Brian used different identities. He was Rudy.
Rudy slept with Deb. Rudy was cunning, smart, calculated, and clever.
Rudy lied and killed to get what he wanted.
Gio has similar characteristics. He got Deb to be with him. He could've lied about picking up something for his dad. The stuff Deb found on the ship did not look like cocaine but maybe a refrigerated unit to house dry ice for his future profession.
Gio and Rudy both loved Deb;s P****y. Rudy just had to come back to get some more years later.
But hey, that's just a theory. Let me know what you guys think in the comments below.