Nowhere is it claimed that the composite sketch was done by an artist viewing his burned body ..Where is it shown that they burned his body? They were able to get a composite sketch of him.
Of course, maybe in Canada they actually do let sketch artists do that, before any coronial examination or.. no. no I genuinely don't think so.
I think that composite sketch was lifted from documents, perhaps photo's, perhaps digital pics on his PC, or phone, I never imagined that it was done by some one with paper and pencil hovering of the body of Prof Dyck. Truly, I don't think that could be the case.