Not gonna read through 20 pages, but my initial reaction after watching in slow motion was that Rudolph got salty that Garrett tried to take him down at the end of the game and so he tried going after Garrett's helmet. Garrett didn't like that and proceeded to dominate Rudolph in response. But Garrett took it too far when he used the helmet as a weapon on a helmetless person's head.
O-linemen were just doing what they were supposed to but imo DeCastro did the smart thing by just laying on Garrett until he cools off (he must have been a fat kid all his life because that's a bread and butter move for fat kids). Pouncey also took it too far with the kicks and punches, but not to the extent that Garrett did.
It sucks because I can see based on the chain of events why Garrett got so heated, and I know how he felt in that moment, but he still went too far.
And clearly everyone involved on the field had some serious adrenaline pumping. It was hilarious to see Rudolph so upset, because in a 1 on 1 Garrett would kill him with his bare hands. Feisty little guy.