I dont think starting from ground zero is necessary. You can right away start process to install dump1090-fa by apt-get method I have given in my last post.
To see myself what is happening, I will now format a microSD card, write Raspbian Jessie image, run automated script and try to install dump1090-fa to see what happens.
For almost a year, I have used the script only for installation of Performance Graphs and adsbexchange feeder AFTER MANUALLY INSTALLING dump1090 & data feeders.
For all my recent installs, I have not used the script for installing dump1090-fa/dump1090-mutability, and any data feeders. Instead I have used the manual method (iBake a P).