The two-striker system has fallen out of fashion a little at the top of the European game in recent years, the kind of centre-forward partnership best exemplified by Andy Cole and Dwight Yorke or Wayne Rooney and Carlos Tevez at Manchester United increasingly seldom-seen. So it is testament to the tactical nous of Stuttgart coach Sebastian Hoeness that the Bundesliga high-flyers have found a way to get both Denis Undav and Serhou Guirassy in the same starting XI, while ensuring that his Champions League-chasing side are not vulnerable to overloads in midfield. Undav, the striker who looked inc…