I hear you
As stated - my premise has never been that a big enough hole in something kills it.
My argument is: adding large amounts of kinetic energy around the hole increases the odds of killing exponentially. Additionally, when the hole may not be perfectly placed, the large amount of energy may have a killing result when it is large enough and powerful enough to damage the organs and create shock to the system. shutting down the nervous system and in some cases liquifying the organs.
Matching was never the idea. The OP was considering going from a 7 to a 6mm. the two photos were not meant to directly compare a bunch of the same. They were meant to support that staying with bigger bullets for hunting will penetrate better, transfer more energy, and damage more tissue than smaller.