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Doesn't the second typing for a starter usually tend to manifest at least to SOME degree in the first evolution? Just seems strange that we'd have a relatively DARK and naughty looking kitten suddenly turn into a Fighting type.
I'm just putting forth the fact that the intention of a dirty fighter and Fire/Dark at least makes sense when you look at the evolution line as a whole.
Combusken, Monferno and Pignite for example all already had the secondary typing and the visual appearance.
Examples like Braixen, Prinplup, Quilladin and Grotle, while not containing a secondary typing, show clear signifiers of what they are to become and even begin to learn moves of that typing.
The fact that Torracat looks more like a dark type and Throat Chop sounding like a dark move does give a persuasive reason to rethink the Fire/Fighting assumption.