Glory to God in Disability??

There is a story about Jesus that has puzzled me for a long time. He and his disciples encounter a blind man who has been blind his whole life. One of the disciples asks Jesus who sinned and caused the man to be blind, either his parents or him. Jesus answers that the sin of no one was responsible for the man's disability, but that it was for the glory of God (see story in John 9).
Now, the quick answer for me has been that of course the blind man was in the right place at the right time, and therefore his healing brought glory to God. This has never been very satisfactory to me, however; why would this man be made with a disability just so he could be healed by Jesus in a public place? Where does this leave all the others born disabled in some way who weren't/aren't healed? Did Jesus mean all disabilities were meant for the glory of God? I think the answer is yes. I think God's sovereignty allows Him to make bad into good. Go with me for a minute. Especially when my children were younger, but even now, when I am around a disabled child (i.e., autistic, physically disabled, even crippled by disease) the selfish part of me immediately would shoot an arrow prayer to the Lord thanking Him again for the good health of my children. I said the selfish part. More on that in a minute. I think part of what Jesus was trying to tell us is that seeing what others might have to endure through disabilities or disease should help us to realize what blessing we have received in good health and be even more thankful to God. Realizing good health is not a right everyone is born with means I have the chance to send glory to God for what I have been given. That glorifies Him on an ongoing basis, if we take that opportunity.
When I see a person who can't walk or never developed properly, it makes me pause & quit thinking about myself - what I am trying to accomplish at that second - and reflect on the fact that I can drive, I have 2 good legs, 2 good arms, and correctable eyesight, as well as a car that goes when I turn the key. I am immediately thankful for those blessings, even though I might have taken them all for granted when I left my house! This is part of what I think Jesus was trying to get us to see - that taking the time to notice our blessings happens partly when we see the lack of those blessings around us.
Back to my selfishness - in being thankful for our good health, should I drop it there? Just count my chickens & say "Well, there but for the grace of God go I."? I don't think that's the last word. Did Jesus just walk through the streets saying placating words to the suffering? No - His heart was touched constantly and He healed and helped people constantly (John tells us at the end of his book that if everything Jesus did was written down, the world would not have room for all the books). When he came to the blind man, He took that opportunity to heal the man. He didn't say he needed to live the rest of his life blind so others could be grateful for their good fortune. He healed the man. That is to be my response. I can also glorify God by ministering when I can to those who do have a special need. This also brings Him honor and helps both me and the person I help see the love of God more clearly. I am to be the Lord's hands and feet to those around me every chance I get.