The third crewmember, variously referred to as a steward, flight engineer, loadmaster and now mechanic has been released from the hospital. 
He does indeed have an A and P license. Hope he can shed some light on what happened but as Pilot DAR points out from personal experience sometimes folks are totally amnesic to an aircraft mishap event.
From the Hartford Courant:
Mitchell Melton, a Collings Foundation mechanic from Texas injured in the deadly B-17 bomber crash last week at Bradley International Airport was released Tuesday from the hospital, according to a fundraising Facebook page started by family.
“Mitchell was released to go home today, lab results came back perfect and tests were normal,” read a 4 p.m. post Tuesday on the #FIGHTLIKEMITCH fundraiser page. Melton worked for the foundation that owned and operated the 75-year-old Boeing B-17. The plane’s pilot, co-pilot and five passengers were killed. Melton was among six people on board who were injured in the crash. A man working at the airport was also injured as he tried to help after the plane caught fire.
https://www.courant.com/breaking-new...jd4-story.html
The B-17 PIC Ernest 'Mac' McCauley appears to be in the lower left corner of this picture from Facebook.
