I would leave him in there if he wakes up crying, from my experience, when they wake up fussing they will usually go back to sleep.
I have had a few of these "loud" cryers too,luckily, I can ignore the shrill most of the time! I have also found that these are the kids who get picked up at home immediately at every peep. In time they get over it once they learn I'm not falling for it....all I can say is patience
