On Saturday, April 27, 2011, an 18-year-old Romelu Lukaku was introduced to Stamford Bridge faithful for the first time and came up with a short and uneventful cameo during a routine victory over Norwich City.Almost exactly a decade later, Lukaku made his second Chelsea debut on Sunday and the circumstances could not be more contrasting. This time, the Belgian arrived as a global superstar, described as the last piece of the puzzle for Thomas Tuchel's side to do a real Premier League title challenge.GOOOOAAAAALLLL! ?On his…