Barkley won't be a revelation this season. Under no pressure in a bunch of friendlies with a manager putting his arm around him then sure, all of his raw talent will flourish and he'll look a world beater.
Soon as he has a bad game or has any reason to doubt himself then he'll go missing for a couple of months and the cycle will reset. Even if he's excellent for a full season, which he just about managed when Martinez came to Everton and put his arm around him, told him to express himself, play with freedom, plenty more cliches where that came from, then as soon as the team lost momentum he hid from the ball for 18 months. It never lasts with Barkley. Unless Lampard has a new brain that he can stick between the lads ears for him, Ross Barkley is Ross Barkley.