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First off, it's Wilson Point and it's ~30 miles downstream of the Greenville gage. According to the posters above (who I choose to believe), BR is ~3x further upstream of the BC spillway.

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You chose to believe wrong baw.

Are you saying it's not Wilson point or it's not 30 miles b/w the breach and the gage? Either way, you're wrong. See the Nav Charts that you provided. Willow point is down by Eagle Lake.

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It says that the river fell 6 inches in the 9 hours between 15:00 on 5/13/2011 when they first noticed the break until 00:00 on 5/14/2011. The point did not fill enough for the river to start rising until 03:00 on 5/14/2011. That means that the river at Greenville gage was dropping by 0.67 inches per hour. 0.67 inches/hour * 12 hours = 8 inches which is close enough to about a foot in 12 hours.

The river wouldn't continue dropping at the same rate, since, no doubt the flow rate would decrease as Wilson Point begins to fill up. From the 2011 post flood report, which can be found in its entirety by HERE.

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Levee patrols were conducted along the Mississippi River Levee to identify the cause of the drop, and after verifying that the main line levee was intact suspicion fell on the overtopping levee near Wilson Point. On the morning of 14 May levee patrols verified that the water level on the land side of the abandoned levee was equal to the level on the river side, indicating that a crevasse had occurred in the levee and quickly inundated the land between the abandoned levee and the main line levee. The Greenville gage began falling at 1500 on 13 May and resumed climbing at 0300 on 14 May after a drop of 0.4 feet.

Apparently it fell by less than half a foot. Also, for the record, 8 inches is closer to 0.5 ft than 1 ft.

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The Wilson Point bowl is stated to be 12,000 acres. Google Earth tells me the Wilson point front line levee is between 20 and 25 ft above the natural ground elevation of the farmland it protects...and it had 1 ft of water above it.
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Wrong. The old levee had sandbags piled up a foot high when the levee gave way. I saw it about two hours afterwards because I was having to help my girlfriend's (at the time) father move his equipment out because he farmed in the point and he was desperately trying to get his cotton planted before the levee broke so he could claim insurance on those acres. The water got much deeper than a foot as this picture from inside the point shows.

It's clear your reading comprehension isnt that great, but you are agreeing with me. There was 1 ft of water overtopping the levee, I was saying that would've filled the bowl with b/w 20 and 26 ft of water, which can then be used to calculate volume.

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opening up the BCS to its design flow should halt the rise and start dropping the river by a few inches each day at Baton Rouge.

There is no evidence to support that claim. BC is designed to protect New Orleans. It may provide very minor relief to a very localized area upstream, but not on the order of even 1 ft all the way up to Baton Rouge.