Not to defend what happened, but I know that Clayton recently had some major health issues that were pretty severe and probably were a factor in what lead up to the incident. He is still a very talented artist regardless of what happened with Mongoose.
I'm certain you will see his work again in future projects down the road once he is able to get his self and his work back into top form should he want to do more cartography work. The key is being able to manage his workload properly so incidents like this never happen.