[ Considering how much evidence was found on the videotapes, Light can't just pretend to be blind. He won't outwardly say she was Kira, but he can pretend to be ignorant of any note she may have now. Of course, it's imperative that she has her own. Her eyes are a key part of the Kira operation.]

Unchecked? That's a pretty cruel thing to say to somebody heading the Kira investigation.

[ Near and Mello's presence is the biggest hole in Light's plan, but the man before him is blissfully unaware of their existence to manipulate the question in the way he'd like. ]

We haven't been able to stop him, but he can't operate openly, either. I'm not happy with only being capable of slowing him down, but managing that much is better than letting him run unhindered.

[ It gives the answer L is looking for without realizing there was even a question involved. His failure to realize there was more of a backup system will be his ultimate downfall.

Then he came here before he was able to fully establish Kira. ]