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Memories of the Incredible forum back in April... everyone thought it (the proximity sensor) was an FFC. And who knows, might be, but several months later and a 720p update around the corner and no talk about "getting it activated".
The ambient sensor is so the display can auto-change brightness, the proximity sensor is so when you're talking on the phone the display powers off so you don't hang up with them cheek whiskers.
But it looks like there is a third sensor/light/camera/whatever.
Does one of the processes (proximity or ambient) use two sensors?
I believe a proximity sensor would have a transmitting IR LED and a receiving IR sensor, mounted together. I think that is what you are seeing on the one with two devices behind the same hole.
The other single device is an ambient visible light detector.