Board Thread:Manga/@comment-27821571-20160923192030

This is something I've seen asked a few times by some fans of the series, and I'm wondering about it too:

Why didn't Grisha just use the coordinate himself, rather than put the world upon his 10 year old sons shoulders?

Was it because he was just mentally unstable after hearing about Carla's death that he was ashamed of himself because he could've prevenetd it? Certain things to do with how the coordinate must be used?

I hope it will be answered soon enough. 