Oh I think I see what you're saying now. He only gives them the initial chance if he has someone else. If that is what you are saying then you are right I think. I thought you meant chance as in, kept them in the side if they proved to be decent. I think Insua as you say got his initial chance because of injuries, but once he proved his worth, I don't think Rafa has any problems playing a youngster.
if you mean when he has no one else then yes that is what i mean ..... kids shouldn't have to prove their worth in the first team to begin with - there is the odd one who has instant success - but mostly it is about finding their feet and adjusting to the pace and passion of the game ...... they should be treated like foreign players first arriving in the prem - you expect them to struggle for at least 6 months as they settle in and kids are the same ..... they need to build confidence and to feel like a proper part of the team rather than just a desperation measure
