back seat bitch
The person in a group who isn't a leader, on the contrary, because this person is a bitch, all this person does is take orders and defer responsibility to the actual leader. For this reason, this person never has to deal with anything that resembles a "high pressure" situation which- at least in their minds- is good because a high pressure situation would cause this person to crack and undoubtedly fail.
"'Did you guy's hear about LeBron James goin' to Miami to play with Dwayne Wade?'

'Yeah I saw that SI cover where LeBron is standing behind Wade. LeBron is such a back seat bitch.'"