Why are the Otsutsuki trying to become so powerful? Thats what initially gave me that thought. Perhaps they are facing a threat.
How is it that the Otsutsuki and Kara have karma seals? Not only that but Boruto and Kawaki appear to have two halves of a complete set.
Either Kara and the Otsutsuki are working together or they are at odds with each other. I think its the latter because Kara seems to be against the use of chakra and there is no way the Otsutsuki would be their allies knowing this.