This might sound stupid, but is there any other way to hit him when he is stunned with something other than the light arrows? Or a way to simulate the damage dealt by light arrows? Is there any way to read how damage is done to an enemy? Someone figured out how to play the songs without an ocarina... so I don't see why something of that magnitude wouldn't be possible.
I just briefly looked over the links you posted, and the one mentioned about getting light arrows on B:
http://tasvideos.org/ZeldaOcarinaOfTimeTricks.html#GettingTheLightArrowsOnB
Its says you are required to beat the Forest Temple. But, just thinking in my head, wouldn't it be faster to beat FT than it would be to do the whole RBA for getting the 2 medallions and watching the cutscene to get light arrows? I know you can just go straight to the boss once you enter FT, but I'm assuming it means you need to get the bow? If you do need the bow, instead of actually getting it in FT, maybe RBAing for it would be faster? I'm just throwing up many questions so that it can stir some thinking.