The details of the situation that the crew were faced with will come out in due course. The SMH already has part of the story, no autopilots. Everything was hand flown from the beginning of the incident. There were other serious system failures which occurred simultaneously with the depressurisation.
Any intimation that the crew went to Manilla due to cost considerations is so far off the mark as to not dignify with a response. It was simply the closest major airport.