Xemnas explains in KH3D that most of the original members of the Organization could not become Xehanorts because they were weak of body, weak of will...
Er, it's phrased kind of awkwardly. I believe Odium is referring to this scene from KHIIFM, where we learn from Zexion and Xigbar's conversation that...
I sort of figured it was Luxord as well. Since he spent some time in Port Royal with all the treasure in the Isla de Muerta, it seemed to make sense...
It was obviously not Riku since he's not an Organization member, and why would he want the Peddler to not say anything about Jafar. If anything Riku...
I doubt it'd be clunky if it was assigned to a L2/R2 + D-Pad command and flowed well into combat, it wouldn't be any different from any other combat...