Oh, ha! Well, hey, you could have just allowed me to believe that you wrote it, and let me be impressed by your mad summarizing skillz.
Hmmm... Yeah, I can see Seven as an ISTJ. Her way of thinking is extremely literal, and not just because she's unfamiliar with certain human sayings and figures of speech.
But the J is definitely there. She has strong opinions and is very decisive, and once she arrives at a decision, it's almost impossible to get her to change her mind. Ironically, even as a Borg, she's not great at "adapting" to new ideas.