It's called setting, they might use them later as they had set a precedent before.If (and Jebus help us) they make more seasons of this show, they need to keep it with some interesting adventures aside the whole leaning about friendship thing. Like facing Nightmare Moon and Discord.Also, the first finale was the Grand Galloping Gala, wich seemed to be lame (A dance! Come on! ) but delivered us some awesome moments (Flutterrage, The Pony Pokey and At The Gala song) plus and several fan favourites (Spitfire, Soarin and of course, Octavia). Why wouldn't this finale do the same, maybe Shining Shield would be a fan favourite now? Perhaps there would be a whole new and awesome song! So far season 2 hasn't failed to deliver (Even with Derpy Wars) and Mrs. Faust is still attending as a conselor to the person who runs the show and she has mentionated that she left somepony capable to keep up the precedent she set on season 1, so I wouldn't worry about it