Insult-filled videos and diss tracks have flown back and forth ... The antics have all been more WWE than WBO. But KSI's manager Liam Chivers insists it's "100% real". He says: "People think ...

and also to do music and do all those things, the press conference, I mean it's a lot, you know." Both YouTubers released training videos, along with diss tracks on their respective channels. KSI ...