I guessed you missed that Kate mentioned Bracken first. And they mentioned 3XK more than once. But the evidence they had didn't point to them, it pointed to Rick doing this himself. As to the other points, we're going to find out more in the next episode, and it may continue for a while. If you remember, we got the story of Kate's mom's murder in bits and pieces too. He 'profiled' Kate in episode 1, but we didn't hear the story until episode 5. We found out more in episode 10, and on and on. So they're not giving everything up in an episode.
And they have said over and over they are getting married this year. I know a lot of people really thought it was going to happen in that last episode but I was never convinced. (for a few goofy reasons - one being that Scott Paulin, who plays Kate's dad, was never mentioned as being in the cast.) I hoped I was wrong but.....
And a little something I posted a few days ago may have given away whether they are getting married sooner rather than later.