No, in this series the angels (Gabriel, Castiel and Balthazar) become the sentinels. In the 'verse, though, it's more common for the sentinel to be the younger partner and to be bonded by the mid-teens, so it's not surprising that Azazel makes the mistake he does. While Sam is pretty happy to become a guide, Dean isn't, which leads to angst galore and a few plot points.

I love TS too and for some reason I seem to want to give every fandom its TS fusion (possibly because it was a H50/TS fusion that brought me into the TS fandom). When it comes to Jim and Blair, however, they niftily inserted themselves into a Pitch Black fusion that is on the WIP list for 2018 ...