Marler mentions "Re-entries" throughout his 1981 book. However, if we look at some of his earlier writing, and consider Baxter's efforts, it would seem clear that there are no "Re-entries" to be found on the Admiral issue.
Most of the plates used to print the Admirals were curved. It was not practical to try to re-introduce the transfer roller to the plate after the plate was curved.
The doubling we see on many Admiral stamps occurred during the initial production of the printing plate. Before the curving of the plate, it was determined that the impression was unsatisfactory and the transfer roller was re-introduced to the plate in an attempt ot improve the eventual stamp impressions. The proper term for this is "Double Transfer".
Most of the major catalogues (and this site) will continue to use the term "Re-entry", but it is best to understand that "The Major Re-entry" on the 1¢ Green, would be more properly called "The Major Double Transfer" on the 1¢ Green.
A retouch will show lines of the design strengthened.
This thickening of lines of the stamp design is a result of the application of an engraving tool in an attempt to deepen lines which were poorly transfered.
We are aware of examples where retouching of the Admiral plate occured after the plate had been put into use printing stamps. See 7¢ Bistre 2L76. There are at least two known examples of this position where the retouching has not yet been applied.
Re-entries and retouches are attempts to make the product better. Plate flaws do not make the product better - just the opposite, they degrade the final product.
Plate flaws can happen before or during the stamp production life of the plate. Those marks were never meant to be present and are the result of damage to the plate before a given stamp was printed.
If we consider that some plate flaws occured late in the working life of a plate, it is reasonable to assume that those type of plate flaws would represent some of the rarest of any of the Admiral isssue's CPVs.