Another random thing I'm leaving here so it doesn't get lost.

I wonder if the alicorns as they are now represent the 4 loves?
Cadence is Eros, obvs.
Celestia, being the self-sacrificing mother figure, represents Agape
Luna, being the loving younger sister, is Storge
and Twilight is Philia http://en.wikipedia.org/wiki/Philia
Image: http://imageshack.us/a/img33/5764/likethischapter.jpg

Comments

[Wellwater]

This seems rather ingenious, but I'm not sure the parallel was intended, however well it fits.