Arranging a rake is not the issue. An extra rake will occupy a line, and blocking a stabling line is not the optimum way to use the resources. Right now, zones are focusing on minimum turnaround time. Perhaps NER should restructure its standardised rake pattern and increase the number of sleeper coaches.
If PM is possible at PBE/MLN, Then yes, they should do it because PM at LJN is not possible right now. If they accept the LR then GTNR is the only option we have.