Although this is interesting some of it could be completely coincidental. Diablo, Mephisto and Baal are all religious beings that are supposed to be "devils." Now, Lord Of Destruction is simply how they fall into each other (terror, hate, destruction). I think the part that lead you to Gnaw is very coincidental because it would not be on purpose that someone decides to use an anagram that fits in like that, it's too far out there. the rest of it though is interesting