<p>The Indian Super League (ISL) is being touted as &ldquo;the best thing that has happened to Indian football&rdquo;, and most stakeholders are sure that the competition is paving the nation&rsquo;s path to professionalism in the game. On the eve of a crucial top-of-the-table ISL-2 clash, Brazil legend Zico reminded aspirants about a courtesy or two enshrined in the top levels of the game</p>