I don't know, Pads dying would be too predictable. Especially when he just came back from what would have been an eternal sleep. It'd be more interesting if Aechmea stored Red Diamond away in his lab somewhere and that ended up being Phos's torso. Especially since Red Diamond's relationship with Sensei was shed light on, then Ichikawa cut away from it completely. The only reason we suspect Pad will be the torso is because it just so happens that the torso is the main focus of Pad in general. I don't know, I just find it a waste for Pad's to die anytime soon.