I was thinking about why this happened. I am a true believer of "things happen for a reason". Hard to see in the moment, but as time goes by and the fog clears those reasons start to become evident.
Thinking about Jack and your family, I see what you have put into spinal cord research and helping not only your son, but 1,000's of others with injuries. You can hear the passion that you have developed for the progress of spinal cord research and rehabilitation.
So, even though I imagine you would do anything in your power to change what happened to Jack, since you can't, you have instead taken the opportunity to embrace the situation and make a difference. Not all families could do that.
When a tragedy hits a family it shows that in just a single moment a life can change, a entire family is altered. What your family has done is shown how to overcome, persevere and inspire! I wish your entire family well! I look forward to updates as time goes by and can't wait to see Jack succeed!