Harry's Eyes, Do we finally know why their special? Options

[Erised]

JK Rowling once said that the fact that Harry has Lily's green eyes is important. I think that their importance has been revealed in HBP. I think Harry's green eyes are important because they reminded Slughorn of Lily. It's because of her memory that Slughorn finally hands over the crucial memory that Dumbledore has wanted all this time. Dumbledore says the memory will "undoubtedly be our most crucial piece of information of all." (page 348, British ed).

British Ed., page70

Slughorn: You look like your father
Harry: Yeah, I've been told.
Slughorn: Except for your eyes.  You've got-
Harry: My mother's eyes, yeah
Slughorn: Yes, well.  You shouldn't have favourites as a teacher, of course, but she was one of mine.  Your mother, Lily Evans.  One of the brightest I ever taught...etc

In the chapter, 'After the Burial', Slughorn is really affected when Harry recounts his parent's murder. But its important to note that Felix Felicis makes Harry dwell on his mother's last moments (and not his father's). Slughorn is so distraught that he can't bear to hear the rest.
After Slughorn gives Harry the memory,

British Ed, page 459

'You're a good boy,' said Professor Slughorn, tears trickling down his fat cheeks into his walrus moustache.  'And you've got her eyes... just don't think too badly of me once you've seen it...'

So what do you guys think?

[Hermione@13]

Well, this might be a little far-fetched, but what if Lily was evil in her day. What if V killed her for the reason Snape killed DD. Mabe that's why V made Snape his equal because they used the same plan. Snape didn't want to blow his cover. Wait! Then Lily would've been evil and DD would've been evil!Then that clarifies my theory of DD being evil!Then maybe V's eyes are red because red eyed look malicious and he never had green eyes.

[Dijares]

Well, this might be a little far-fetched, but what if Lily was evil in her day. What if V killed her for the reason Snape killed DD. Mabe that's why V made Snape his equal because they used the same plan. Snape didn't want to blow his cover. Wait! Then Lily would've been evil and DD would've been evil!Then that clarifies my theory of DD being evil!Then maybe V's eyes are red because red eyed look malicious and he never had green eyes.
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No, JKR has already stated that there was no reason for him to kill her, other than she got in the way.