I've beaten Crota on hard with glowhoo equipped on a character that hasn't even touched the normal raid this week.
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And, its rng after the requirments are met. Read the whole post.
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What's your source?
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apparently as long as you have the shader on any character the crux has a chance of dropping. this is confirmed with DBO(Destinybungieonline.com) although no official statement from bungie. basicly you have to have done the raid at least once before and obtained the shader.
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We just carried a random through last night on his first hard run, didn't have glowhoo anywhere and he got the crux, I think they changed the drop rate now and it should drop a lot more often, no requirement other than beating hard mode.