I have posted MULTIPLE sources to prove my point.
Go ahead, post a source that says Carwin fights at 300 lbs.
Since Carwin says himself he slowly loses his offseason weight over 3 months, I assume this is what you believe happened:
UFC 84 - Carwin drops weight slowly to 252 lbs, no weight cut required
UFC 89 - Carwin drops weight slowly to 264 lbs, no weight cut required
UFC 96 - Carwin drops weight slowly to 259 lbs, no weight cut required
UFC 116 - Carwin bulks up to 300 lbs during offseason, well over his usual 275-285 lbs. Carwin chooses NOT to cut weight over 3 months before UFC 116 but instead chooses to stay at 300 lbs. Before weigh ins, Carwin dehydrates himself 35 lbs to step on the scales at 265 lbs. After that, Carwin gains the 35 lbs back to fight at 300 lbs.
So, you basically believe that is what happened, right?