Not all of whom are Shadowkind, or even proficient in magic or "Shadow" arts.

Some of our members are human, born of this world, with no talents that mark them as anything more than determined and willing to learn how they might aid those from another world, or face threats that come from another dimension. [ he doesn't sound particularly impressed by these people; it's more of a matter of fact statement. ]

But as you say, all of them are bound by not only their desire to be here, but by the impression they leave upon us.