IMHO it is well known that claim accuracy varied during the pilots' careers, but from what I know, or from what I think I know, some were more reliable claimers than others, mostly because they had more realistic view of their abilities, better ability to critical analyze, better situational awareness and maybe they were less interesting of personal glory. In other words fighter aces were humans as we all.
On Rudorffer or any other ace, many pilots were poor in a/c recognition; it would be simpler to check other side's single-engine losses and twin-engine losses.