I don't think they would go as far as to give us Jonin Minato, he completely rocked the meta when he came out in CN. But I do agree, anniversaries are times to really let loose and give to your player base. Look at companies like Square Enix, and Bandai with their mobile game's anniversaries. FFBE just had it's 1 year anniversary and it was great. Special event dungeon, special raid boss, free pulls all month, daily gifts, and free currency. If there was ever a time to take inspiration from your competition its now.