Wrath of Khan line seemed a little forced. It is an interesting idea- in episode 2 or 3, I speculated that Khan's seeming self-sacrificial character toward his people was trying to form him into a dark mirror of Kirk, a Kirk gone wrong- that metaphor seems to return, slightly, setting up Khan and Delmanda as a Kirk-and-Spock friendship that could have been; which is an interesting idea- this logical, alien, thought-provoking presence that could have become his friend and advisor if Khan had been a different man. However, while that's an interesting concept on paper, I don't think it was nearly well-established or well-explored enough to have any resonance in the series. If that's what they were going for, the groundwork needed several more episodes (or at least scenes) to be laid.
Then again, I could also be reading too much into it and it was just a clumsy line re-use, a la Into Darkness.