Jigsaw had a couple of plot twists that added to John Kramers backstory, but it missed one final twist reveal as it never revealed who picked Eleanor Bonneville (Hannah Emily Anderson) up at the end. The Saw saga seemed to have come to an end in 2010 with Saw 3D, also known as The Final Chapter, but the franchise had a lot more to tell. The saga came back to life seven years later with Jigsaw, directed by the Spierig Brothers, and set after the events of Saw 3D and a decade after Kramers death.
https://screenrant.com/jigsaw-movie-eleanor-ending-car-pick-up-who/