Rananim
The chance of a student brain surgeon (who must be a consultant surgeon anyway) spotting a mistake in the slice of a blade, and notifying the mistake before it is made is slim (That is why in 2004-2005 2000 people died as a result of human error world wide in aviation, and 750 000 people died in the same year in the USA alone from medical human error - YES 750 000!!).
We are actually good now in mitigating human error in aviation. It is easier for your FO to spot your mis-set altimeter or the fact you are cutting the corner to the ILS than in the medical setting above. I wonder how many times you have made a mistake, then spotted it and rectified it without telling the FO, just to save face?? - Only you know!!
Your anology is very worrying for the future of aviation
Let me try an analogy;can a med student offer concrete advice to a brain surgeon,should he even try?Doesnt mean the brain surgeon wont seek a second opinion because he thinks hes infallible;he'll just seek it from another experienced brain surgeon.
I think here you are implying, do not seek advice from the 300 hour guy but just another Captain. Well you don't have another Captain on board on the flight deck do you? Just a guy with 300 hours.
I leave you with a final thought
'Experience is the thing that you get 10 seconds after you needed it!
After 17 hours military flying, i had an experience which i successfully handled, which lead to a prestigeous award. Neither my Squadron Commander, my Wing Commander or my Group Captain had had a similar experience in a total of over 90 years of flying 'experience' between them.
Moral of the story is - 'Experience normally comes with time in the job, but you just never know what that rookie has done'. It's not to late to learn before you retire with your family. Don't let the young rookie be that guy that knowingly allows you to take him to the scene of the crash! You are the mentor, you are the father figure, you set the conditions. I can name a large number of pilots with 15 000 hours plus who killed all their passengers, and had, as a major factor, ignored the (correct) input from their percieved inexperienced FO's.