And why do you think it's important that Connally is holding his hat in his RIGHT hand? If you think that he dropped his hat after getting hit, you're wrong. The testimony from his wife is that he held onto his hat in his RIGHT hand all the way to the hospital.
In 1976 the Itek Corporation, specialists in photographic analysis examined the film and five photo analysts all concluded independently that somewhere between Z-223 and Z-226 there are signs of the beginning of a significant change in the governor's position and appearance.
Thus your argument that Connally reacts a full two seconds after Kennedy is shot has no basis in fact.
The basis in fact is that the wrist wound was the least of Connally's problems. He had a golf-ball sized hole blown in his chest. He had a sucking chest wound. His wife saved his life unwittingly. As she drew him down out of the line of fire she pulled his arm over the chest wound. She also placed her arm over her husbands arm and thus sealed the open wound. She did not know to do this, it was just an accident of the event. She was clear. She saw Kennedy's hands at his throat, later she heard the shot that hit her husband. Now rifle bullets travel faster than sound, but she had already heard the shot that hit Kennedy as this was what caused her to look back at him. In any event a sucking chest wound is not something one can ignore. Look at the film. While Kennedy has his hands at his throat Connally is turning forward. He faces forward then turns back to his right. It is some time into this turn that he is hit, as described by his wife. The film shows exactly that sequence.