Les overall the German night fighter arm knew that unless they were on the ball on every mission they could be shot down by Allied nf's especially the Mossie. It is just that for some crews they personally felt that the most concern they had was the RAF 4 engine heavy and the return fire of the .303's ! strange eh. losing power, or hits from the mg's on critical areas could then mean they were dead meat in the air for any allied twin engine fighter. both RAF and German Ju 88's radar implements could detect one another, it largely depended on whom was the quicker on the ID and the firing button. I have to think from interviews, reading, and chatting with other research friends, archival documentation that in most instances the German crews that were shot down were under great fatigue and became careless as there is enough losses reports mentioning the Ju shot down in action (im Luftkampf bei nachtjäger). Evidently the radio man was able to call in to say they were under attack..........many times too late. Also truth must be made of the landing shoot downs and the many accidents of pilots not paying attention during a landing approach and due to Mossie scares.
Reality for the German nf force shows that the He 219 gruppe I./NJG 1 and the Bf 110G-4 units suffered the most at the hands of RAF night fighters primarily the Mossie. Again I share my feelings that the Ju 88G-1 and especially the G-6 version was equipped with very suitable rear warning means.