Thank you both very much for you suggestions! Your answers are very helpful! I think I'll use a combination of both your recommendations as I proceed.
Henry's birth record was discovered only recently and he is recorded simply by his surname. Going by the BCG proof standards, there is evidence from other authoritative records that support the conclusion that this is indeed Henry. No question about it.
Veritas is also my motto, not just Harvard's, and yet I was actually struggling about whether or not to continue using John and Cathy as Henry's parents in my genealogy research. This is amusing because I'm a "shine the light on it", "rip the band-aid off", "truth above all else" type of person and researcher. I suppose I was secretly hoping for some sort of dotted-line way to report the relationships using RM5 -- as if that would somehow make it gentler to other researchers, which is completely absurd!