To-Oh summary

Firstly, L's self-revelation was insanely unpredictable. After Light had killed the 12 FBI agents and reduced L's influence to a handful of task force members, one would think L would hide even more. But he decides to reveal himself to Light instead. He uses this to watch Light's reaction upon this shocking event. This reveal is also perfectly shielded. Firstly, L used an alias by the name of the famous pop star, 'Hideki Ryuga'. If Light were to write this name, he might end up killing the pop star instead and this would immediately tell L that his suspicions were correct. Even if he got the Shinigami eyes to find out L's name and kill him, the nature of this reveal makes it so that any attempt to kill L at all would put the suspicions on Light. L has only revealed himself to Light, if anything were to happen to him, Light would be the prime suspect. In fact, Light cannot even be sure that the person he is seeing is L, he might just be sending a proxy. This multi-layered shielding completely neutralises Kira's supernatural abilities and any attempt to harm him in general, he overcomes an asymmetrical position flawlessly. This revelation serves long-term goals as well. He uses this revelation to get closer to Light. He anticipates that Light would ask for some kind of confirmation for L's identity, and the only way for that is for them to visit the task force together because L has revealed himself to the task force, Light does not know this, but he infers it, and L …