That's pretty amazing for only having half the locations and being closed on Sunday.
It seems like KFC's problem is that they just don't have a go-to chicken sandwich. I remember the gloriously ridiculous double breast sandwich, and I know those terrible little Snackers, but it's a bad spot to be in for a place that only sells chicken to not have a chicken sandwich people come for.
A sandwich is just something people will buy far more regularly than fried chicken.
I love me some Bojangles, but I get a sandwich there about 8 times as often as I get fried chicken.