[JeffM]

From this angle, it is difficult to judge precisely when he has gathered, and therefore, whether his right foot was still on the floor when he gathered.

It would be even more difficult in a game unless you are using a three-man crew with the play coming towards the C.

During a game, I would pass on it unless I was sure that it was a travel. I woiuldn't doubt my partner if he/she called it and I wouldn't have the benefit of seeing it from their angle.

There are a lot of you tube videos on how to execute the jump stop. The keys are to (1) gather in the air and (2) land simultaneously on both feet. If either of those occurs, the move in the video is legal. If they both occur, either foot can then be the pivot foot and he can take one more step.

From a coaching standpoint, can you live with it being called 10% of the time? If not, then he shouldn't use that move until he can execute it correctly all of the time. I suspect you can live with it since you probably have to live with other turnovers and missed shots.

He could also show the move several times in warmups where the officials might be observing the players. If the officials see him perform the move correctly in warmups, they may be less inclined to call it in a game. However, this could backfire if they see him perform the move incorrectly before the game. During warmups, the officials are doing more than just watching to see if anyone dunks.

My opinion is that players "have gathered" later in the move than when many fans think it occurs. I think fans consider one hand contacting the ball after the last dribble to mean that the player has gathered it.