This is a question of statistics and likelyhood. There is indeed a danger to be killed by a down falling roof tile, if you leave your house. But we all feel quite safe, leaving our houses .
If I found the same version of an Oak leaf on ten different order bars from ten different places/collections, some of them coming directly from the family of the awarded person, there is a very small chance, that some crazy guy had all these bars in his dirty hands.
And why should someone do that? There is not such a big difference in the value of a bar with or without Oak Leaf. If I decide, that a combination of awards on a 1870ies bar is interesting for me, the price I am willing to pay, depends not on this question.
If we consider, that besides all this, the feared setting happend, shouldn´t we find not so obvious differences in preservation?
In the end: variant 5 is very likely a fake - I found this version only on ONE bar. Variant 10 is to be found in a AWS-catalogue of 1908 - I compiled until now EIGHT examples of this version on different order bars
Best regards, Komtur.