Originally Posted by rickair7777

Pretty obvious to me that the intent is that once on any part of the arrival (inside KOZAR or JAMOX) you're EITHER doing 280 OR descending at mach to transition to 280 when you get there.

If the guy ahead of you is higher and descending he will slow to 280 but you get to keep cruising along level at 300 until you catch him? Makes no sense.

The AIM might reinforce that.