Why was it decanonized? I enjoyed the JG stuff I read. (Indeed, I've been thinking of using Darthanon Queen and Simba Safari for the Gateway to Destiny stuff if I can get around to figuring out where to put it.)
Because GDW overwrote 2 of the 4 in Atlas of the Imperium, and either didn't want to or couldn't get permission to use the JG materials.