They will find the burrow, just like in BA, they just haven’t found it yet. Back in 1993, it was before Rumsfeld was around, so there’s no one to show Sam the way to the home of the littles near Bobby.
I’m sure Arthur and the others would love to welcome in a wee Sam, but I don’t think Dean would like his wee little bro vanishing! *Panics*
Brothers Apart 