I don't think the plan is for Foran to be a traditional 9 if Walker is retained at 5/8. I think at the start Foran will come on off the interchange after 20 and only partially play the hooker role with a starter filling in also, giving Foran the freedom to be the third option ball player and allowing Manly to have several options.The idea of Foran playing at 9 is growing on me. Watched the tigers game and everything they do starts with Grant. We had nothing at hooker this year except a deer in headlights.
At least with Foran he can direct the team around, have a smart passing and kicking game, will take the ball to the line etc. Yes will have to do more defence, hopefully his body holds up. Could turn out to be a masterstroke? Wait and see
Might also mix it up and have Walker and Foran designated with left and right side hooker duties, forcing DCE to play more central and using each as 5/8's depending on what side the movement starts.(so at all times we have two halves in play)
Will take a lot of work in the off season to get that complicated mix right though and have it gel as you are asking a few players to take on several roles and to always be on alert---high risk of disjointedness but could be a game changer having so many ball playing attacking options on the field at all times.
The main benefit of this system is that both Walker and Foran can take the line on and be tackled with the ball, and not just always play before the line wanting to be available for the next play---having two halves on call at any one time.