Thank you for the reply. I'm not sure if you followed what I was asking or how lease residuals work (please read this with a nice tone, I'm not trying to be a jerk). With the lease, I'm "renting" and paying a "rental fee" plus interest (money factor). The residual is about 55% so I'm roughly paying 45% plus interest (yeah, other fees too). So, $10k BEFORE the lease begins means about $4,500 plus interest - and the lease calculator on the site pretty much bore that out - as leasing and adding the $10k FSD raised payments by I think $157 a month - which is just a hair more than $4,500 over the 36 months. After the lease is up, I have no car, and no payments, and no equity - so the FSD is a non event to me after the lease.
If I buy the FSD one day after the lease (unless a subscription) it will cost me $10k clams - and I would get back $0 at end of the lease - so IF I really want FSD later, my only real two options would be buy, and buy the car at the end of the lease, or subscription model.
Thanks again for the reply!