[DownTownTonyBrown]

I went back to section #204 and found that I had underlined "Having the Lead move ball-side leaves one half of the court completely uncovered, therefore officials should use this mechanic sparingly..."

Diagram 9 does show 7 players in the Trail's primary area... although I think if the timing is right, based upon how deep the ball is (toward the end line) a Lead switch to the other side of the key may well be called for in diagram 9.

Diagram 11 shows 6 players in the Trail's primary area with 2 others impending but still in the key... However this time the ball is rather high (near the 3-point line and foul line extended). A Lead switch here seems premature.

Of course one must take into account the tone of the game and who the player is with the ball (Does he drive? Does he pass? Is he over his head when he gets near the big guys in the key?) Da-da-da-da-da... and you can't get that sense of the game from a diagram.

Your understanding is likely right-on, Nine. Stay or go it is the Lead's decision; Trail makes the adjustment if Lead takes responsibility for the ball by moving ball side.