I must say, I have never leased a Jag. But looking at the F-Type lease which was just posed here they combined the loyalty with the lease cash. So there could be some crazy cheap leases if you own a Jag because you could potentially get $21k in rebates if I am not mistaken. I would also think you ban add one of the dealer cash rebates as well. I am not sure what the allowance credit is for so a Broker might need to clear that one up, or someone who has done a Jag deal before.
Have a look here, you can see how the rebates stack.