Is the following true?
I believe the key benefit of Gloaming Cut comes from this section of the stealth rules:
Not Remaining Hidden: If you take an action that causes you not to remain hidden, you retain the benefits of being hidden until you resolve the action. You can’t become hidden again as part of that same action.
This would rule that other attack powers that grant movement do not allow you an attempt to hide because the movement is part of the attack action. Gloaming Cut provides an exception that allows you to attack, move, and hide, all as part of the same action.