I just think that the german company choose to buy the Inyouchou Shoku licence for any reasons: maybe because it's more madness in these episodes than the original ones.
And keep in mind that inyouchuu and Inyouchuu Shoku have not been produced by the same japanese company :
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by Amour and Suzuki Mirano
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by MS Picture.
So for example if the german company Trimax had a kind of agreement with MS picture in the past, it has been easier for them to get the licence of these OVA.