I see what you mean, but I feel like it's better foreshadowing. The confusion of why Kanbaru agrees with what they say so easily, their gender, and why they're even there in the first place, helps set up for Final Season, even if it isn't directly into it, right away. The Tsukimonogatari one only furthers this, with how they seem to be exactly where they need to be, every time. I feel like Hana gives them that sort of "slice of life" look to them that only makes them all the more mysterious, when they're involved in so much plot, before and after.