Well, a few very successful QB's have been left handed such as Steve Young, Kenny Stabler, Boomer Esiason, to name a few. So, maybe Leinert can get there. But left handed QB are pretty rare in NFL overall.
As I think I understand spin on the ball, spin will cause the ball to change trajectory slightly off the straight line in direction of the spin and thus the drag of ball may cause some drift in that direction, as will wind speed and speed of the ball thrown over a distance, and delivery mechanics of the throw.
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