Talvalis, you are projecting. better yet, that is your perception
Perception is a nice word, because my interpretation is founded on what you can actually see in the story. Manga is a visual medium, you cannot ignore visual cues.
- Just because a story ends up in a Yuri/Lolicon publication does not mean that the all characters will play to that genre.
Yes, it kinda does. Now, you can subvert a genre, you can deconstruct it, you can have a bad end. But that isn't done off-panel. If the last panel in a yaoi story published in a yaoi anthology is two guys looking at the sunset, the implication isn't that they will start dating women and be bros4life. Unless you are a yuri fan obviously, because in their mindset, if you cannot see the Enterprise safely parked in space dock after warping away at the end of an episode, it obviously got eaten by a space dragon mid-flight. A straight, male space dragon.
Well good for Koyuki, however if we project real life on this situation
This isn't real life, it's fiction. Fiction uses tropes and symmetry. Her first game of wait-and-see, 'wasted energy and effort' wasn't endless or futile and this one won't be either. That makes immensely more sense to me as a story structure then "Oh hey, as a special treat for all my readers who went out and bought my yuri tankoubon in addition to the magazine, I've added a few pages that turns a hopeful good end into a she's-totally-straight bad one. You're welcome!"