I can not comment on vbdynamics or vbulletin. I am commenting on vbgallery
The setting here is very explicit below and relies on you setting users can change style to NO.
Quote:
Default Style
Select the default style for your gallery. This style will be used for all guests, and any members who have not expressed a style preference in their options, or are attempting to use a style that does not exist or is forbidden. this option rely on the option above being set to no
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We are not going to load some specific different style for someone who has a style choosen. The setting above is basically for guests or users who have no style. As I have written the way the option is designed in the gallery it works.