Board Thread:Boruto Discussions/@comment-945885-20171013084137/@comment-1512913-20171016203808

Considering that Ao says it's been 16 years since his last actual combat and Kara dude knows how powerful Ao truly is to trust him enough not to need any weapons to beat them even in his old age and crippled stage, I would say that Ao had been an outer for Kara earlier than 4th great war.