I don't know, when Ingles gets that chest high pass, his no ****back return for 3 is one of the most beautiful things in basketball right now. I think he does the slow release sometimes as a way to taunt his defender. Niang's trigger is pretty decent too, even though he's no Clarkson.
"In motion" though. some of them may be able to release their shots fairly quickly but they have to catch the ball in a certain way, mostly from a standstill position facing the basket just so they don't have to spend time squaring their body before shooting.
i'm talking about guys who can catch the ball from any position at any given speed, then immediately come to a halt, square their body to the proper shooting motion and release the shot.
Shooters like Bojan, Niang and Ingles are already in the proper receiving position and ready to shoot before even catching the ball, which makes it predictable for the opponents because we always run same set of plays to get them open.
Guys like Redick, Korver, Klay and hopefully Thomas in the future, on the other hand, often times are running at a high speed right before catching the ball, which adds the unpredictability to the play and the opponent have to stick to them at all times to make sure they don't get to shoot.
They don't rely on certain set of plays to get open. In a way, their mere presence on the floor adds an unique set of play to your offense that help other guys get open.