This is true. You are the first one to get that far, so I'm counting on your analysis of the situation to make a final decision in that regard. You may be right, I just always hated that Alder is the end point in challenges, because it's a real grind trying to catch up with him, especially when you can't rematch the E4 at their initial level. So maybe I will set BW2 to Iris' first fight, just so there's an easier option. But I'd like to see how things go with your playthrough first.