Conor Gallagher was the only Chelsea player to impress for the whole 90 minutes of last night’s victory over Crystal Palace. That is according to ESPN pundit Frank Leboeuf. Chelsea ran out 3-1 winners yesterday away to Palace in the Premier League, but it was very much a tale of two halves. Mauricio Pochettino’s side trailed at half-time and managed just one shot during the opening 45 minutes. Thankfully, the Blues reacted in the second period with a much improved display and three goals. Conor Gallagher, who scored twice on Monday night, reminded everyone of his importance. The 24-year-old bo…