SA, would you agree your description of the J toss matches up with the above pictures this way?
"The motion of the hand describes/simulates the letter J.
The hand starts extended out toward the net.(not shown in the above pics.)
It moves downward and inward (closer to the body). (pic 1)
As the hand reaches its lowest point (pic 1), it hooks back upward (and often slightly forward) (pics 2,3,4) -- thus making the letter J.
With the J-toss, the arm often lifted parallel to the baseline (or somewhat parallel)."