That about sums it up!
I had to do this preliminary exploration to see what was happening from the different launch points (PDE sketch, exported sketch, different folders). I learned a lot along the way!
It can be trickled down to only what is what is necessary once you examine it.
Start commenting out lines; some are dependent on previous ones!
Have fun!
Take a look at this as well to launch multiple PApplets (sketches):
:)