Since others are repeating themselves, then so will I.
Nitpicking the Narada/Kelvin scene is pointless.
The whole point of that scene was to establish George Kirk as the heroic father who scarificed himself to save others, including our beloved JTK. That's it!
Either you get that, you miss that point, or just enjoy nitpicking.
The minutiae of the details are easily exaplained just by speculating and is pointless unless it's enjoyable.