The thing about opinions is that everybody has one. In my opinion the type of bleed over from the highlights to the shadow we have been disucssing is in no way way a phenomna of staining develoeprs, as Bob K suggests.
However, if his opinion is indeed true it would be quite a revelation and I am certain that a well-documented study that could conclusively prove that staining develoers are more prone to bleed-over in this type of situation than traditional developers could easilsy get published in one of the national magazines. Some simple paramemters are the following.
1. The scene needs to be one that juxtaposes extreme areas of lighting, and it would be good to also have some fine detail present, such as tree limbs and leaves.
2. Both negatives (same film type of course) need to show the exact same scene, be exposed at the same exposure and within seconds of each other with the same lens and hood set-up. The position of the camera must no change between exposures, and the light must remain consistent.
3. The negatives must be developed to the same density range, and this DR should be the effective exposure scale (ES) for the process (or type of paper) being used. This could be determined by reading the densities with a densitometer, making sure that the correct color mode that is used for the stained negatvie is approriate for the process.
4. The result would have to be clealry visible on a print.
5. And since development artefacts are not uncommon the result would have to be confirmed with at least two or three additioinal separate tests.