Magick, clan, resurrection-as-working. Ventress walked in and out. Merrin stayed and then chose a crew. The Great Mothers traded Thrawn a road home. They fled a stir Baylan walked toward. Brendok’s coven named the field the Thread and treated it as stuff you can pull. They saw the connection. They assumed a substance. The connection is not thread. It is the current moving through all things.
Not Sith. Not Jedi. Do not file them under Grey.