It seems to me that Fisher is comfortable with Case, even though Goff might be better even now..No one knows until Goff is in there doing his thing. So..the only way Goff enters the game is: 1) Keenum is injured. 2) Loses several games in a row.
I would love if it was possible to insert Goff in where he could elevate the offense to another level without the season being over, ushering us into the playoffs....I just don't know if that's possible, however....Fisher likes to start veterans, so Case will play until he dies.