It could use some companionship, it's why it's peeping non stop.It's not with other chicks. Unfortunately one of the "moms" already pecked the second chick to hatch to death, and their is only one other chick left now, who they are good to
Bringing the other chick in with this one may help quiet it down and stimulate it to eat drink etc. But then you'll have to brood them both yourself, and if the one weak one dies you're stuck with another single chick that the mamas probably won't take back.
Tough call.