They're guaranteed a pantheon...and almost guaranteed a quality pantheon. Great expanse making more tiles online upon foundation means any faith pantheon in the vicinity of capital can get worked starting on T20-T30. You can also get a +60 ruin slightly later to help catch a religion earlier so they're like the 4th best civ to pick a religion. After Ethiopia, Maya, Celts. That's very, very strong. Better than just situational IMHO. I'm biased since most of my Shoshone plays have been on the DF start I provided for the CV guide but great expanse+timely picking of growth ruins is also extremely strong an opener. It's one of the few civs you could realistically aim for NC followed by REX and still grab high quality tiles from the rex because the timely pop growth gives a lot of additional early beakers and hammers.