Flying a twin-engine aircraft anywhere within effective .303 range of a bomber over hostile territory would seem to be less than smart, given bomber loss rates and the fact that everyone knew that there were ten Mosquitoes in the sky versus ****-knows how many Ju88s.
The raid on Nuremburg on 30 Mar 44, carried out by 795 aircraft from Bomber Command was met by 246 night-fighters. 94 Lancasters and Halifaxes failed to return.
Not sure about Luftwaffe night-fighter figures for the night of 19/20 Sep, but 1 & 5 Groups Bomber Command sent 227 Lancasters supported by 10 Mosquitoes to bomb Monchengladbach/Rheydt. 100 group sent a further 15 RCM aircraft and 17 Mosquito sorties. 4 Lancasters were lost in addition to Gibson's Mosquito - Gibson was Master Bomber for the raid. The low losses suggest that the night-fighters did not penetrate the bomber stream in large numbers.