Messi is pretty much synonymous with the number ten, I remember when Ballack's agent made the 13 shirt part of the deal, which resulted in Gallas leaving because of Kenyon taking it without his consent. If this deal happens (it won't) but if it did.. Hazard would have to take Drogba's 11 when he becomes coaching staff, or go back to 17. Messi without 10, from a 'branding perspective', is like Nike without the swoosh.