It's a new and interesting step splitting responsibilities, however I'm skeptic though. Somehow reminds me of our tenure under the double managership of Evans & Houllier. Clash of personalities may be a bigger obstacle than many would possibly have thought.
I think it's very different to that.
The two managers never had completely different set tasks.
They were both in the dressing room, they both came up with tactics, they both spoke to the same member of staff, scouts, players, etc.
One guy given the task of administation (probably a businessman/accountant), and another to help player recruitment/negotiations (probably an ex-scout/manager/coach) might well work out fine.
There's a line they'll both have to cross, but shouldn't be an issue for them to perform day to day.