question about sovereign fiefs who died out before they could be mediatized

I was going over a list of fiefs listed in Europaische Stammtafeln and
wondered if anyone could affirm whether or not they were equivalent to
such families as became mediatized around 1825. In other words: were
they sovereign.
Breunner as Cts. of Asparn.
Tattenbach as Cts. of Rheinstein.
The ancient landgravate of Leuchtenburg.
Leuchtenburg when held by the Princes von Lamberg.
The Princes von Trautson.
The Princes von Eggenburg.
Cts. v. Barby
Cts. v. Hohenstein
Cts. v. Callenberg
Barons of Heydeck

AND as far as France goes: were any of these considered sovereign
(like Brittany or Burgundy):
The Dukes of Anjou (Capetian).
The Dukes of Alencon
The Counts of Artois
The Barons of Avaugour
Were any of the members of the house of Carency (descended from
Capetians), such as the Princes de Carency.
The Lords of Bourbon l'Archambault
The Dukes of Bourbon.
Lords of Dreux

How does one tell when looking at a genealogy whether a fief was
sovereign. Europaische Stammtafeln (especially those done by Freytag)
offers alot of tables for Hoya, Brederode, Bronckhorst, Cuyk, Diepholz,
etc. besides those listed above. I know Eggenburg and Trautson would
seem to be obviously candidates for the sovereign label, but the others
might not seem to be and yet were.

Also confusing is the idea that I thought that a prerequisite to
sovereignty was either the owning or holding of a independent fief.
But if that is true (and it does appear to be when you deal with
Esterhazy and Thurn and Taxis), why is it not when you come to
Carolath-Beuthen which owned/held the Freier-Stanesherrschaft auf
Carolath und Beuthen?

And lastly: does anyone have an idea where I can look to find a list
of those families/fiefs which was sovereign in the HRE and France?