Villa's brightest is either Jack Grealish or Callum Robinson.
Grealish is a pretty pacey and skilful winger, could be a fairly good player if Lambert actually bothered playing him. As for Callum Robinson, he's a 19 year old striker who's just been recalled from a loan deal at Preston, where he scored 5 goals in 11 games. He's also scored for England at every youth level.
Who's your team's brightest prospect?