I hope I'm wrong but I've assumed Garriock wants that job or already has it. If that is correct then it's really bad 'corporate governance' (uggh, I feel gross just saying it) for a start. It's just not done except under emergency or unforeseen circumstances and in the very, very rare event that a board member takes on an executive or administrative role, it's temporary.
I mean, that's what these boards are supposed to be for. To avoid conflicts of interest and making sure the people signing the checks aren't the same people paying the bills with them. It's also to ensure a board maintains a strategic and governance lens while the executive gets on with the day to day administration of the business.