Update:
I'm running about 12 hours behind on these, sorry. This morning my dad was showing similar finger movement in his right hand and his left was even better.
Our latest concern is that he has developed a red spot on his back that may be a bed sore that is forming from the inside out - that's the worst kind. He keeps insisting on being on his back and not on either side - that's going to change. He can't be on his back except for PT and to eat, then he has to be back on his sides to let this thing heal. In spinal cord injuries (SCI) above T6, there is a strong chance of Autonomic Disreflexia - essentially the Vegas nerve that goes to the heart starts picking up "warning" sensations, such as pain or a full bladder, and tires to take that signal to the brain. The problem is that in doing so it stimulates the heart, resulting in rapid pulse and high blood pressure, which can lead to stroke. So this bed sore is not just a sore, but potentially life-threatening. Not to mention SCI also results in some compromising of the immune system due to the damage to the autonomic response.
Damn, sorry to go all doctor-vocab on you guys.