I hope I am wrong but I don't like this appointment.
He has no experience of being a head coach at any level.
His previous role as forwards coach/conditioning coach was not hailed as a success. The team often looked out of shape (we miss Apollo, etc.) and the forwards often got out muscled by smaller packs.
His status (quite rightly) as a saints legend makes sacking him if he is not up to the job very difficult. The club will not want to do it and the fans may revolt if it is done.
He has only ever been at Saints so he can't pull any strings to bring in players using external contacts. You doubt that many players outside of St Helens would want to play for a KC coached side.
He has played for several years with our captain (Wello) who Brown had (rightly) worked very hard shift from the team. Will there we a conflict of interest for KC, will Wello react well of KC does something he doesn't agree with etc. etc.
Anyway hope I am wrong. We will find out in the next couple of weeks if this is the correct choice.
Best of luck to him.