I believe that a personal guarantee would not be listed in the bankruptcy proceedings because it is outside of the company. If a creditor has a personal guarantee from a director or owner of the company it will not be listed. I am sure that Ryder, BVD, Pilot Flying J, and Grand Financial will have some sort of personal guarantee.
The top 60 or so are numbered incorporated companies. I would guess that most of these are 'Driver Inc' participants who cannot get their monies from the carrier in a timely manner. If this is the case I hope that they learn that this is a consequence of 'Driver Inc.' and get out of that model before it happens again.
From SAFER you can see that their insurance carrier cancelled their policy on May 1, 2020 and the FMCSA revoked their authorities on May 11, 2020. Looks like this has been in the works for a while now.