Thank you. Yes, you understood well.
I hope you are right so I did something wrong, however all my testing shows the same, common section is ignored in style, both volume and velocity settings.
You are right, common settings are general settings for all elements in voice, this setting in common are applied to all samples/layers/elements in voice or drum kit, however those settings are ignored if voice or drum kit is used in style.
Effects are the first I checked, everything is turned off and set to thru, both drum kits are made the same way, both with exactly the same values in YEM , the only difference is the RMS loudness of the samples between those two drum kits so one is set to 100, while other one is at 117 in common section, which results one being louder in style while both being the same in Right.
I did some testing with both, voices and drum kits and in both cases style simply ignores settings made in common section.
Yamaha uses 100 as their default value for common volume, and everything else should be done on oscillators/elements in regular voices, or with every key in drum kit, which makes this process very slow if you have many sounds, like I do.