It was rather surprising to see how much the following two games ret-conned from Apollo's first game. Apollo's back story was completely changed, the idea of jury/lay judge trials never went anywhere (ironically until the prequel series which takes place in the UK instead of Japan-erica - and I am aware it was shoehorned in AJ as Takumi advocating for jury trials in Japan), Apollo seeming to have a falling out with Phoenix off-screen then reconciling almost instantly, they just seemed to only carry over Apollo, Trucy and Klavier, and Trucy and Klavier didn't even necessarily need Apollo to be there to be relevant. Fortunately the ret-cons worked out for the better for his character. I would imagine any future AA7 will feature at least one case in his office in Khura'in, and Athena will take over Apollo's former role as Phoenix's main protege/successor.