Noah only loses about 20 pounds.
The pics where he is monster huge are also 4 years later than the ones where he looks smaller. He had gained about 50 pounds of beef.
All the ones where his is about 290 are from 2000 and 2001, he competed at about 300 in 2002. He is only up by about 20 pounds over his contest weight every time.
In 2004-2005 he was up around 345-350, he could have competed at 320-325 then, was planning on it, but he decided not to for personal reasons.
Its not that he would lose a lot of size compete, he just was not as big back then when those photos were taken.