RE: Specific calls vs Specific Gobblers
They will Associate the call,once the hen's start to set you should have a good chance he will come looking for that hen that doesn't show.
You could use a mouth call or paddle box call.
If your buddy is with you go at it with fighting calls,It should bring the boss hen in to investigate thus bring the tom with her.
If you have two decoys set them up.
Good Luck to you