Appreciate everyone's input here. Glad to be a trailblazer and hopefully help others after this situation!
I guess my biggest confusion is why is the foreclosing bank (Deutsche Bank in this case) not responsible for satisfying this buyout number Vivint gave me to purchase the system outright ($15,763)? I understand it's not a lien, but the system was in the previous owner's name and I guess logic would tell me the bank is responsible for paying this off, just like the $26,000 Federal Tax lien that was cleared off title.
For future educational purposes to everyone, Vivint gave me THREE options:
(1) Buyout the system for the above $15,763. I will be negotiating HARD on this number and this is my most preferred scenario.
(2) Assume the roughly $150/month agreement which I would then have to pass on to the end buyer when I rehab and flip the home. IF THE BUYER DOES NOT WANT SOLAR, I WOULD BE REQUIRED TO REMOVE THE SYSTEM AND REPAIR THE DAMAGES OUT OF MY POCKET. I have no desire to go this route.
(3) Since this is a bank owned property, Vivint will remove this system and repair everything free of charge. I will go this route if I'm forced to, but the selling point to the end buyer of having no electric bill and roughly $2,000-$3,000/year in SREC is appealing obviously to the listing.