The reason he will not be able to get a JAA ATPL is because he doesn't hold a current multi-pilot Type rating,
This kind of thing makes me laugh (well it would do if I had not personally met so many people who got shafted over this) because anywhere else in the world you can have an ATPL without the silly assumption that you must be an airline pilot.
Years ago, there were avenues one could use to convert an ICAO ATPL into a JAR-FCL one, with just a paperwork exercise. Ireland used to do one.