
I didn't know he had been battling cancer. So you have Father Cekada and now Bishop Kelly succuмb to cancer. Didn't Father Collins also die of cancer? Could there be something they were all exposed to?
There does seem to be a "changing of the guard" here, where that first generation of Traditional priest, who were alive as Vatican II first began to be implemented, are beginning to pass away. That's one reason for the shift taking place in neo-SSPX, where we have more and more cradle Trads who really don't understand what happened at Vatican II.
Father Collins died of pancreatic cancer.
Father Cekada had bladder cancer, which he recovered from, but then had fragile health ever after that, had a few mini strokes, and eventually a (I think) relapse of the bladder cancer.
Bishop Kelly also had cancer (I'm not sure which kind) but also had multiple other health issues. He had been sick with various things for at least a couple decades. I distinctly remember being told while accompanying a CSPV Priest to a sick call back in 2009 that Bishop Kelly was not doing well even at that time.