
Snape is clearly not the "most faithful servant."
We know for a fact that Barty Crouch Jr is not in the circle, but he is a DE, and he has obviously been helping Voldemort for almost a year. He obviously can't have been the one who was too cowardly to return, nor is he the one who has left forever, and he's not dead either, so by simple logic he must be the most faithful servant. And remember, you discover Crouch Jr. after the graveyard scene.
So the plot twist with the most faithful servant has already been done. There can be no further argumentation about it.

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