i agree that a disciplined song would be a very good player - unfortunately he isn't.
he's also not really a vocal, organising type, and he lacks nous. seemed like we used to find guys with those attributes fairly easily (edu, gilberto). i'd much rather guys who get it and have something going on upstairs (like those two, vieira, arteta) than a clueless dolt like song. wenger doesn't do match-specific tactics (i think this debate has finally been resolved after 9 yrs), so we need coaches on the pitch.