There would also be word on the street …..(crew room) - whether these Pilots always operated within the companies standard operating procedures. Some will cut corners, bend the rules and take chances for example flying into bad weather when they should have returned. Pilot's do not like delays and can in some cases push the envelope. I would imagine interviewing other crew members who have flown with these 2 would be interviewed as well. We have to take a Crew Resource Management Course - yearly. This is designed for all crew to be able to interact and feel comfortable in discussing issues that arise in flight. I can remember working for an airline whereby the Captain was Muslim ….FO Hindi and the FE was Christian, don't bring up religion in the flight deck.