Idriss Déby killed several rivals over the years: Abbas Koty in 1993 and Ibni Oumar Mahamat Saleh in 2008 to name but two (AC Vol 52 No 9 Déby on top)...
In 1992 with other Zaghawa he joined the rising by Déby's in-law Abbas Koty and led his Conseil National de la Révolution fighters in Darfur...