Who the fuck likes that roach? I wish the Waynes had fucked his family over even harder.
I think that, after Ep1 was released, the 'Cobblehot' hashtag started floating around Twitter. I think Telltale simply became aware of that and... well, I think this answers your question.
If you ask me, Oz was relatable in Ep1, but he wasn't a villain yet; in Ep2 he was all 'fight me', so it wasn't much; Ep3 was a typical 'testing your patience, I'm evil muahahahaha' guy.
Don't see what's to like about him, TT simply cashes in on people's reaction to his design - young, somewhat handsome man with an accent. Nothing more to that.
And I wouldn't say he's the greatest TT villain. To tell the truth, I don't think TT is capable of creating one. Jack was funny, but this doesn't mean the same as LIKABLE. Mary was a psycho and nothing more, Randall and Carver were good-turned-idiots and Whitehills were so bad they seemed like characters from a cartoon. Hell, the stranger from TWDS1 was the weakest point of the game. The only time TT came close to a compelling villain was the Crooked Man, but even then it was ruined by his final moments (trying to strangle Bigby and drag him down the well).
Not commenting on Vicki yet, but to me, that twist is utter nonsense unless it turns out she's mixed with some other comic book character. We'll see.