If a computer created a composite football player to capture the imagination of England fans, it's pretty easy to imagine it coming with Jack Grealish.After all, you've got echoes of past heroes with David Beckham's No7 and shiny hair, the dribbling ability of Paul Gascoigne, and well, choose the 1970s showmen for the socks that are thrown low on the big calves. There is even a song in his honor of the mansion, simply titled Jack Grealish and with the phrase "Brum town Baggio" to honor the Birmingham-born Aston Villa…