Blueblood was perfect. He truly had it all: charm, wealth, intelligence, rank, except... that.
So his Aunt, bless her great wisdom, decided to help him acquire it. Perhaps participating in the search party for those missing ponies will help him find what he lacks to be the prince he was meant to be.
Of course, it could never be that easy. And no, it will not be that easy.
Far from it.