[guenthar]

This is my most favorite episode of my mosat favrite series ever.

Spoiler:

What I think about how the criminals for the past 2 weeks could have been killed is that before Light turned himself in he wrote someone into his Death Note with details to make the person pickup the Death Note. After that the person would write the names of the criminals for the past 2 weeks and from then on till he gives the Death Note back to Light and kills himself.