Oceanic 6 press conference and cover story

Here is the Oceanic 6 press conference led by Oceanic public relations representative Karen Decker. She goes through the Oceanic 6 cover story and here's the basics:

• Based upon the wreckage (most likely the fake wreckage), the survivors crashed near an uninhabited island in the lesser Sumba islands called Membata. They made their way to Membata using cushions and some life jackets and were carried by the ocean currents.
• Kate gave birth to Aaron on the island of Membata.
  
• On day 103, a typhoon washed up the remnants of an Indonesian fishing boat which had basic supplies and a survival raft.
• On day 108, the remaining six survivors used the raft to go to Sumba, and landed near a village called Manukangga. The photo (the last screen) was taken by a fisherman as the washed up on shore.
• Once it was discovered who the six were, they were transported by the US Coast Guard to Hawaii.

We also learn as part of the story that Jin did not survive the crash. Sayid also says there's no chance that anyone else survived.

Geez, what a story. Is the birth of Aaron going to cause suspicion about the cover story? If she was supposedly six months pregnant before she got on the plane, there would be potential witnesses to the fact that she was not pregnant, one being the police officer in Australia the marshall was talking to in one of the flashbacks.

The Oceanic 6 reunited with their families

Here's the Oceanic 6 (Jack, Kate, Aaron, Sun, Sayid, Hurley) about to land at Kalaeloa Airport to be reunited with their families. Oceanic public relations representative Karen Decker lets them know that they're about to land and that they do not have to talk to the press if they don't want to. Jack says that they will talk to the press and they've all agreed to do so. When she leaves, he says, "we all know the story" and "if we get any question we don't want to answer or we can't answer, let's just keep our mouths shut."

When they land at the Coast Guard Air Station, Barbers Point Hurley's parents (Carmen and David Reyes), Jack's mom (Margo Shephard) and Sun's parents (Mr. and Mrs. Paik) are waiting for them. There's a lovely reunion and Hurley introduces his parents to Sayid. No one was waiting for Kate.

In the first show, you can see another person in the plane besides the six and Karen Decker. He/she appears to be a member of the Coast Guard. Why are the six comfortable talking about their cover story in front of this person?