...even "mastering" Hookwoof would fall under self-defense. And as Calle pointed out, there was no way in hell the PRT was going to prosecute a 12-fucking-year old girl.
No, the smart move here would be for Calle and Danny to go to the damn media and scream to the heavens about how his half-asian child pre-teen was kidnapped by the E88, she then killed Kaiser in self defense, and now the PRT was holding her against her will. Hell, have Codi recover the footage and post online Kaiser's pre-execution speech to show exactly what was happening. Then you would have not only the public and the Youth Guard trying to tear Piggot apart, but the ABB as well because they would see her as "one of theirs." Worse, Addy would be a rallying point for the ABB as the PRT "arrests an asian for the crime of defending themselves from those blonde-hair blue-eyed bastards."
No offense to those with blonde hair and blue eyes, you are very pretty people.
I'm fine with the Wards joining, yet with that said you had a much more interesting low-hanging fruit just waiting to be plucked. Hell, Addy could litterally have walked out of the PRT building. Null lance a fucking wall and bird-a-port the fuck out. Recover your stuff later.
Edit:
Hell, throw Codi at the PRT. Have her build a digital trail that says Addy is to be released. And if anyone throws up a stink, Codi can just lock all their bank accounts. I mean ALL of them. Every Cape, Ward, PRT officer, office intern, Piggot herself. And each day that Addy is confined, another major PRT office gets the same treatment. I imagine that Director Armstrong and Legend would demand the girl be released when they try to buy groceries, or pay their employees, and they can't. Codi is powerful enough to hold the entire nation by the balls. USE HER!