There’s defintely something missing
We never saw Kate shoot Ryan, now you’d expect after she did, she’d take jo in, because she set her up to be murdered.
But she didn’t. She went on the run, she trusted jo more than she trusted the police, and she did everything she could to evade the police, then didn’t wish to put her gun down.
So something is to be revealed there as to why Kate did that. It’s not a natural course of action, up until that point she’d never have done that. She’d have taken jo in,
So the fact we never saw Kate shoot Ryan, and then suddenly after it her behaviour changed oddly and she was sure she was being set up, not by jo but by the police, shows somethings yet to be revealed about that.
The whole thing is missing, Kate actually shooting Ryan and then what happens next to cause Kate to go on the run with the woman who just set her up.