Hmm, I didn't even notice Tatsuki in the ending. I just assumed it was Rukia. I guess I've been spoiled! Even though you'd have to have been blind not to notice that she was going to become a spirit fighter at some point.

There's no way she's going to be weak when she finally fights something, because that would be pointless. When she finally awakens to whatever powers she has, she's going to be really badass at least at first.

Of course, that scene in the end might not even be of the fighters. It might have just been a shot of Innoue's friends.