We have a Thomas Melrose married 12 miles from Edinburgh, and a baptism 35 miles away on the Border. Nothing in particular to say they're the same person. But if we say they are, then obviously we're discounting the spelling difference as random noise.
So protecting the spelling is pointless pedantry at best. And without seeing the image, we could just be protecting a transcription error or an indeterminate squiggle. Presumably the name only appears once, ie "Thomas son of George Melross" is all we have.