He believes, though, that he was fined for being a "peacemaker" in the brawl between the players.
Although he wasn't included in the initial list of fines from the end-of-game melee, DeCastro revealed he was fined more than $14,000.
"I can't wait to hear the explanation for trying to break up a fight," DeCastro said Wednesday. "But I guess it's some dumb rule in the NFL where you can't be a peacemaker."
Offensive lineman Ramon Foster was also fined, levied a $3,507 penalty for entering the fighting area.
"They sent me the letter, and it basically says, 'You cannot contest it,'" Foster said. "Which is pretty insane to me. I was on the field around [the fight]. I didn't even do anything. Really didn't do anything.
"The letter basically says you can't walk toward a fight. Being a peacemaker is no excuse. Across the board it basically covered it. I'll probably still appeal it, but that $3,507 is gone. It's going to be a short Christmas."
DeCastro's total was the fourth-highest individual fine stemming from the altercation. Rudolph received a $50,000 fine, while Garrett was fined $45,623 and center Maurkice Pouncey was fined $35,096. Garrett also received an indefinite suspension, while Pouncey was initially suspended three games that was reduced to two games on appeal. Each team was also fined $250,000, and Browns defensive tackle Larry Ogunjobi was suspended for one game.
"It's funny to me, honestly," Foster said. "It's funny. I hate that a lot of guys lost money behind it. It's comical to me. It's a game. It shouldn't be much more than that. However people view what they need to do while playing us, do it. I know my guys really don't care."