The JCAB doesn't allow the pic Xcountry to be "second in command performing the duties of pilot in command while under the supervision of a pilot in command." whereas in the U.S. it does.
Sounds reasonable to me. Diesel was able to obtain his FAA ATPL by virtue of his PICUS time, which is all legal and above board. Unfortunately, as I said previously, the JCAB do not recognise PICUS so to qualify for the AJX job Diesel will have to ensure he does have both the 250 total AND the 100 cross country
PIC hours before he can apply.
Just to clarify, 250 PIC can be in propeller planes as an instructor?
The requirement is only that you have 250 PIC (plus the other stuff) and there is no need for it to be in jets. Whether that makes you competitive in the selection is a different matter but your PIC can be in propellor driven aircraft.