I don't feel the villian is Mitchell or someone like him. Cumberbatch's villain is said to have a "cause" and have a very good handle on right and wrong. Not something you could say about Mitchell, post transition. He had little regard for morality or loyalty etc. Presumably the SS Valiant villain would be similar.
While both might be upset at humans trying to kill them, it would appear to be rather a Basil Fawlty type revenge (thrashing your car with a tree branch) from their POV . You might as well take revenge on an ant colony. That seems fairly petty and doesn't sound like the sort of motive we are hearing about.
Combine the above with Karl Urban's "joke" that it was Mitchell and I think the odds of it being him or even someone similar are rather long.