World 2 has no intro and no ending scene. If I removed the footage at the hub, I could fool you into thinking there's no World 2, but it does exist (and its seashells do too. They're evil).
The team's mission feels very hopeless. All they can afford is revenge by now.
Again Ai acts like she's not fit to be a leader. I don't know how much was intended. One of the documents mentions Ai being very hyper, but her portrait makes her always look like she's really bored. Her dialogue doesn't help.