Rather than asking for this... Shouldn't you be asking for what happened to the idea of FC Summonable Primals?

Can't recall too much about what was said about the idea previously other than I believe they were supposed to be able to captured(?) somehow by an FC which would then have exclusive rights to summon and fight that primal within a time limit... And from the sound of it, it wouldn't be simple 8man like todays Trials...