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I think that pudge is new and is being initiated. Pudge has also joined the Colonel and his friends who seem to be isolated from others.The Colonel explains that Pudge cannot go to the administration after he is nearly drowned by the Weekday Warriors because there is an implied code of trust amongst students to never rat each other out. Instead, the Colonel puts his faith in Pudge when he allows him to join in on their pranks to get revenge on the Weekday Warriors.
The Weekday Warriors believe that Pudge ratted out Marya.