IMHO the IJN losses in this ATL-battle were a bit too heavy for too few losses on the USN side. I expected the Japanese to have scored more hits on the US battle line.
There is also no mention of the Japanese using Lond Lance torpedoes here. Wasn't that common practice for the IJN?
Read the second paragraph.
Two destroyers have that many torpedoes?
Also, I´m pretty sure destroyer torpedo batteries were mounted on the centerline, to be fired to either side; only cruisers had separate sets of tubes on either side.
15 torpedoes out of 32 sounds a bit much as well; make that 6 or 8 DDs that had outflanked the Japanese screen in order to attack the battle line with torpedoes, only arriving after the main battle was mostly over. The US certainly has enough DDs in their screen that they Japanese cannot keep them all away.
http://destroyerhistory.org/goldplater/index.asp?class=GridleyClass
"Torpedo battery: Sixteen 21-inch trainable torpedo tubes: two quadruple wing mounts on each side of the main deck abaft the stack."
Or go here:
http://www.ibiblio.org/hyperwar/USN/ships/ships-dd.html
and scroll down to "Gridley Class" and you can see a simplified layout drawing.
Against a maneuvering target, or before the USN implemented field fixes for the Mk15, 15 out of 32 would be ASB. Against a damaged, non-maneuvering target at fairly close range (possible because the IJN BB's are rather distracted by the 16" shells still landing on and around them) an upgraded Mk15 having a 50% hit chance seems perfectly reasonable to me.
Edit: also, look here:
http://en.wikipedia.org/wiki/File:USSGridleyDD380.jpg
You can see the portside mounts just aft of the boat davits.
And here are the starboard side mounts:
http://www.navsource.org/archives/05/0538004.jpg
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