Holding the opponent by the singlet is under "general prohibitions" and the penalty portion for those is pretty open to interpretation. I am guessing precedence comes into play too, but not sure.
"These general prohibitions are sanctioned based on the severity of the foul (disqualification, caution-1(2) point or verbal warning)."
https://uww.org/governance/regulations-olympic-wrestling
It is in there too, though the wording is different and odd (avoiding the Wrestling in the center of the mat).
At least for the finals they sprinkled in the WFS and Greco to make sure there was an audience. When Brooks beat Taylor the place started emptying out. They made an announcement that there were still five matches remaining. If they held all Greco in a row, almost no one would have been there. WFS as a stand alone would have done better than Greco, but much worse than MFS.
First thing to hit was his right elbow followed by both cheeks and his back. Sure looked like four, but they said there was not enough evidence to over turn, rather than confirm.
One other thing I noticed. When they are showing the reviews on the scoreboard they have two views, one is a regular camera the other is a fisheye lense. You cannot tell anything from the fisheye lense view because it make everything look farther away. It seems like they do not have enough cameras so they set one for fisheye. Another example of USAW doing an ameteurish job running this tournament.
He first ran over to the rail and was yelling at Burroughs after the Mesenbrink match. He ran it back after the Nolf match, but alao seemed to take it up a notch. As a dyed in the wool PSU fan I was disgusted by his behavior. I couldn't here what he said, but it looked ugly.