Not sure about 2 crews but perhaps so.
I know that the aircraft switches back over in CWL after the morning BHD-STN-BHD has returned. The other CWL aircraft then operates CWL-BHD-STN-BHD-STN-BHD. So maybe the crew does those sectors, overnights, then does BHD-STN-BHD-CWL the next day?
As for todays flights, ive noticed they've been running nice and early though the 18:05 WW4204 is now showing an estimated 19:55 departure. That would mean it will most likely arrive back at BHD around 22:20. Ouch, wonder why???