couldn't that be done with soraka?
Its really a question of how many resources we have free at the time of the legendary record. Someone still has to write the script, get feedback on it and iterate on it, record the lines, edit the lines, implement the lines in the game and then loc it for every region. When we do legendaries we usually look if we have bandwidth to do all that, since these are done by people already working on a bunch of other projects. Sometimes the stars align and we can do them, other times people are slammed with other deadlines so we cant.