When Pap was Bit then slayed, it was in the nightfall events...had Kash been their intended victim I'm sure it would of been mentioned that their bite was messed up by the Lynch.
Why are you sure of that? That kashta was going to be their target is the only logical explanation unless LabRat isn't giving the priest credit when credit is due. There is no reason for the vampires not to try and turn someone each and every night. Either they get a new team mate and get closer to the 50% to win or they kill off an innocent.