The AI gets tougher as your win streak gets higher in prize fights. If you want easier opponents, then you can lose a match on purpose when your streak gets high enough so you can face easier ones again. If the difficulty was the same throughout and everyone could go on an endless win streak, then making it to the top ranks will just be a matter of who can grind prize fights the most – instead of it being more skill based like it is now. I've won matches where the enemy team was all golds and had twice the FS of my all silver team. It's more skill based now than ever. because now you can't do the unlimited combo anymore, and you have to time every attack right. I managed to win in the end with just a tiny bit of HP left on my last standing fighter. Where if the AI difficulty was the same as 1.1.1 I'd probably have won with 2 fighter alive and at full HP while the point fighter barely took any damage cuz unlimited combo is OP.