In the same way that we dont always get movie characters made because they werent in the early concept art given to DST (final whiplash, silver samurai), think of event waves the same. DST was likely given early art and picked from what they were given based on a logical process. I'm sure they weren't told how the even was going to play out specifically or who would be more important that who. And they may have also been told to lay off characters fox has movie rights too. So God Doom and the maker may be important to the story, but that doesn't mean they are available to make for the wave.