The P-40 used at the Fighter Training Schools for US pilots is equivalent to the Bf 109Fs and old Fw 190As used at the Luftwaffe 'C Schools'. In 1943 some still had some clapped out old 'Emils' on the books.
The term 'advanced trainer' can mean many things. Miles Master anybody?
When Dieter Kragelow took of in a Fw 190 D-9 on Operation Bodenplatte it was only the fifth flight he had made with JG 26, and his fifth in a D-9. Theo Nibel, who was famously brought down by a bird strike in his Black 12, was on only his third flight, and third in a D-9, since joining JG 54 about two months earlier.
This is absolutely typical for late war Luftwaffe pilots. Not only did they leave the training schools with few hours and poorly trained, they received no further training at their units. Many units seem to have preserved these young men by not allowing them to fly operationally unless absolutely necessary. Fuel shortages were a good excuse.
If you have lost nearly 150% of your fighter pilots in a three month period, followed by another 99% in the next three months then there will be an awful lot of pilots who fall into your '10 or fewer combat missions' category.
In what six month period did the RAF or USAAF lose well over 4,000 fighter pilots? There really is no comparison.
Cheers
Steve