Adam is from raid summons, not part of the regular pool.
I looked at the info for the upcoming nier raid boss and it sounds like it may be a pain to farm the highest tier each orb. Super hard boss, 4 million hp, etc etc. There may be changes for Global of course, but so far the bosses we've been given early have either come with no changes or they've been buffed.
I'm lapis refreshing some TM farming to finish off a copy of machine killer before the raid drops Friday. Reading JP player comments, it sounds like you need to farm the highest raid tier with minimal orb waste to have enough materials to craft all of the gear.