Wasn't comparing a CB to a midfielder, though, was describing the skillset one would need to be a 'good' one in each role. For fun, check out the "roles" created over the years, heh, Mezzala vs BBM or stuff like a Segundo Volante or Regista. Ah, but you meant diversity in terms of the team, had thought you mean each player would need to multi-task. Never really watched Rugby, wonder how that would compare.
You think Canadians care about football ? Most of these cultureless WASPs only care about hockey.