Khun Wiwat was not a DM but an Instructor. Furthermore, it would be interesting to know what Khun Wiwat was wearing during the dive that he went missing, When he was wearing shorts and a rash vest, it could well be part of his remains, however, if he was wearing a shorty or similar dive gear, it's very unlikely, imho, that the remains belong to Khun Wiwat.
Limbo,
Agreed - that is why I put the note about the accuracy of the reporting on my post. Personally, based on the amount of bodies that wash up in the area I think it would be unlikely to be that of Khun Wiwat.