I would probably go with Celestia and Luna. Even though in the comics Sombra is good in the mirror issues of the comics, maybe he could rule better than they can.
That is one nice diagram you have there. Anyway, I think that time passes by very fast in the show where a year could have passed by and on other occasions, the timeline of the series could have more than one year gone by.
The abundance of jerks, because they were just really mean to Fluttershy which caused her to go to Iron Will in order to be more assertive. Frankly, this episode was really not my favorite at all.