Of course the problem here is that the GP can't actually be sure that every link he wanted to fix in the final step was fixed; just that the ones that _were_ fixed were fixed right!
The whole point of using a second-order diff was to allow me to reliably carry forth the knowledge gained by my exhaustive review of the prior diff. That exhaustive review told me that there were a dozen broken sentence-end links. And that's how many showed up as fixed in the final, second-order diff: one dozen.
So the prior and final evidence, together, allowed me to be confident that the adjustment worked as intended.