There is a fine line between challengers and pretenders – some set their tone from their outset, while others leave things to chance until it’s too late.Orlando Pirates were the Premiership bridesmaids to eventual winners Mamelodi Sundowns for the last two seasons, thanks to their ‘pretender’ antics.But such has been the Sea Robbers’ quickness to come out of the blocks this season, they are all but tipped to knock the Brazilians off their perch for the title.Sundowns lead the title race with 30 points, three ahead of Pirates, who are second on the log and have a game in…