What exactly is the "standard" for additional legendaries, journey, GL type characters. I am relatively certain that any new legendary or above listed category should be added to the journey guide before launch (kit announcement) or when added to the game. At the latest you would expect it to be added to the game at the time the event is live.
JKL is missing, before him we had GLs, before that it was GAS. If the journey guide is there to actually help players, please use it. If you add a knowledge base you need to use it and this needs to be taken into consideration moving forward. I'm not sure why it just wasn't done this time around. The only logic is to stop hyperdrive owners from being able to buy packs, but beyond that no logical reason.