Projected out to Rothlisberger is a pretty big projection for a guy who was 3rd string on his college team.
As far as taking a flyer, the team better be pretty well stocked if they're taking a chance with a 3rd round pick. You can take a guy who works in the line rotations or can play special teams, at the very least, or a QB who might never see the field.
NFL guys live for film. I can't even understand how watching the same play 20 times helps but they swear by it. So, yeah, they'd want more film on Jones. To see how he reacts to situations. 3rd and 8 can have many options. Rush from the middle, left, right, no rush, zone, man, blitzes, cover 1, cover 2, quarters, etc, etc. Even the score matters in the situation.