Basically These two are CR's train..So ECR cannot extend it as its own..
There should be a demand for a new train...be it for LTT or Pune.... 12149/50 12141/42 run packed.... So logically extension is not possible...Mr. Sinha didn't assure about extension...
Anyway it's up to the IR... But Railway shouldn't put PPTA ARA into RLWL list if they extend these train to MFP,otherwise it will be a great injustice for Patna people....