Willie would be a great "ASSISTANT" Coach.
With the U20's it was his job, he was solely responsible and as many have mentioned, wasn't very good at it.
Although the Assistant's job is technically a step up, there's a lot more places to hide, and a lot more "hand holding" in that role. If the U20's lost it was Willie's fault, but nobody ever blamed Franny for our disgrace at Wembley did they (or any other loss)??
Willie's qualities are clear for all to see, dedication, commitment, work ethic, motivation, likeability. All qualities which could easily see him excel when practically being Tony's coffee-boy and when used as a sounding board for any ideas, without any of the key decisions to make, or any responsibility with the fans or media should those decisions go wrong.