Happy?
"at the end of the day, everyone is happy".
On a sector with four crew, at the end of the day, everyone is dead tired!
Interesting query on ego. In most cases, ego can work AGAINST a functional flight deck; check CRM training and data. On the modern airline flight deck, Captains encourage participation in the operation. This includes everyone who is sitting on the flight deck regardless of rank. A strong display of ego will normally inhibit participation.
Likely a topic for a new thread.