In Zombieland, why does Tallahassee say there are 6 survivors left?

In the part with Bill Murray, he says that he's happy because Bill Murray is 1 of only 6 survivors left on Earth. Who is the other survivor other than Bill Murray, Tallahassee, Columbus, Wichita, and Little Rock?In Zombieland, why does Tallahassee say there are 6 survivors left?
Likely not the makeup artist, Bill said they "showed him" not that they were alive or that they did his makeup. Good guess though.

This question is all over the net, I think he just picked that number because he thinks there has to be at least one more person besides them. Although they do show the nun earlier in the film who drops a piano on a zombie it's not actually confirmed that the group of people we see knows about her.In Zombieland, why does Tallahassee say there are 6 survivors left?
Bill Murray Little Rock Himself Wichita and Columbus, and the make up artist who did Bill Murray's make up

superchips

mike geary