The ‘pilot’ of this season for Supernatural was indeed great start to the series, because it had a complete back story to why they do the thing they do. Losing someone that important would make you wonder why it happened or who did it. And apparently John Winchester found out not ‘who’ but ‘what’ did it.
And this is how everything ‘SUPERNATURAL’ came falling into place for the series ‘star brothers’ Sam and Dean Winchester. For as the series ‘recap’ mentions…The dad wants them to pick up where he left off, saving people, hunting things, the family business. But I must say it's one HELL of a business hey run.