I'm not going to question it tbh. The ways of Chaos are best not understood.
I like how he's turned out though and it's nice to have him done. I bought him way back when War of the Spider released last year and he's been gathering dust on a shelf ever since. I'd done a little bit of work on him, but not really anything beyond a few base colours.
Then I finished work early last night, sat down at my hobby desk and just started messing around with him as the nearest model I had to hand. Next thing I knew, it was five hours later and he was sitting finished in front of me!
It's very odd how things like that happen sometimes. Let's hope I haven't used all my hobby mojo in one go though!