Quote: THGoldI was right! There is a soul gem for top and bottom!
I'm Pretty sure there is only one Soul Gem per Character.. If you look at this video at around 1:09 you see the Soul Gem for the top half of Wash Buckler (Found in Twisty Tunnels)
http://www.youtube.com/watch?v=oaBicMxctNA
And in this video at around 1:47 you see the Soul Gem for the bottom half of Wash Buckler (Also found in Twisty Tunnels)
http://www.youtube.com/watch?v=Q_f9dfpfMeM
One Soul Gem will unlock both the top and bottom abilities.
hmm, interesting thing you found....