Having your metabolism drop should mean that the individual can adjust their eating / activity levels to compensate, but only if they are paying attention and NOT falling back into old habits. I'll bet they aren't. The article says that Sean Algaeir put back on all the weight he lost (~170 lbs). That's not yo-yo weight. That's return to normal behavior weight.

"Mr. Cahill knew he could not maintain his finale weight of 191 pounds. He was so mentally and physically exhausted he barely moved for two weeks after his publicity tour ended. But he had started a new career giving motivational speeches as the biggest loser ever, and for the next four years, he managed to keep his weight below 255 pounds by exercising two to three hours a day. But two years ago, he went back to his job as a surveyor, and the pounds started coming back." <- he went back to old habits and gained the weight back.

Like the quote from Dina Mercado says - "The cravings are there.” I'll bet after a time they gave up and largely went back to your old habits.