Neither do I, it was apparent that DK never did any research on Gravus or he wouldn't have done that to Gravus. In my world Gravus is still alive.
Yes its very clear that he did little to no research. I think that he just pulled names from the game and he didnt care about their back story in the game. Also when you look at the time this book was being worked on BW was having major issues, so I think they just let him go at it with out oversite. This book is a good case in when giving someone too much free rain can hurt an ip.