Greyscale Textures look in Texture Editor do not match Material Editor or Final Results

Greyscale image compression and sRGB settings are rendering different results in the Texture Editor versus the Material Editor and in game.

Texture Editor (sRGB = True, Compression=Greyscale):
[Link Removed]

Material Editor (Texture Sampler = Greyscale):
[Link Removed]

Texture Editor (sRGB = False, Compression=Greyscale)
[Link Removed]

Material Editor (Texture Sampler = Linear Greyscale):
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1. Import Included GreyscaleTest.tga
2. Set Compression to TC_Grayscale
2. Create an Opaque Unlit Material
3. Plug the GreyscaleTest Texture into Emissive

RESULTS: Texture Editor and Material Editor Preview do not match

EXPECTED: Both Previews should match.