Plenty of actual (and possible) momentum shifts thus far.
Seattle looked solid, then all Atlanta, then Seahawks hold Falcons to a FG.
Getting the ball downed at 1-yard line would have been a completely different situation if game was played in Seattle, with that home crowd noise.
Either early season loss to Rams or week 16 home loss to Arizona, take your pick, is difference for Seattle playing on road rather than home here. I know it is early but that difference between playing at home vs away looks like it could be difference in this game, and end Seahawks' season.