Lu Zihao's stance for now was to neither accept nor reject his sister's offer. He had always trusted her abilities as a world-class hacker but allowing her to join in his path of revenge was another matter that needed careful consideration. Besides, his original path of revenge required some drastic modifications as well.
Iris didn't force him to accept her offer right away either. There would definitely be a time that he would need to borrow her skills as a hacker.
Bacon was powerful but still immature in so many ways. So was Ketchup. Her two cat AI children would definitely join the war against the Vetrovs' enemies but both of them still had a lot of growing up to do before that.
There were multiple methods that she could use to power up all of them but everything would be easier with her brother's full cooperation. He knew more things about the enemies than she did.
@arriacross