Yes I don't think David in Georgia was 'so much' worried about the 'developing part', (though the two full frames do allow more room for laying than a real 'mini' mating nuc ), as much as he is concerned about the fast overcrowding part in a true 'mini' mating nuc. It is my understanding he has many mating nucs to tend to, that his time might not allow him to go through them fast enough. It is also my understanding that fast overcrowding and swarming is his real concern from my understanding.
Your post is very interesting and I appreciate you sharing the information. When I looked up Klindworther I found no pictures. I am not familiar with those. But by your recommendation, I am interested in learning more.
Thanks,
Phillip