So there are 6 sisters and two brothers. The brothers look like guards and the sisters look like airline stewardesses (Come Fly with Us or Die!)
Probably the Brothers at the hall came up with the idea but only sisters were willing to meet and greet. The two Bro's at the back were blackmailed into doing it.
The thing is, where are they going to run to, when difficult questions come up? Will they point at a screen and say, JW org. has all the answers? Then they will look pretty dumb.