User blog comment:Thescarypea/EmpyreanSmoke, please confirm that your friend's an SPN writer/@comment-95.112.174.130-20151002135427

We have:

http://www.imdb.com/title/tt4489486/fullcredits?ref_=tt_ov_st_sm

so basically, the last episode was only written by Eric Kripke and Jeremy Carver

On the other hand, Reichenbach had way more writers

http://www.imdb.com/title/tt3831300/fullcredits?ref_=tt_ov_st_sm, mentioned on the end of the page:

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In about a week we will know all the new writers of the crew.