It's creatine, guys - and if you take it, you add water to your body, specifically in muscle cells. So you get heavier, and you look bigger, and you have the ability to recover from work faster, so you can work harder.
It's the harder work that helps you build & keep what you build. It's the water that adds the weight.
apochromatic may have gained 10 pounds in 2 months - but it was mostly water, not muscle. sorry, apochromatic, but that's the truth. if you worked harder either from the recovery effect of the creatine or because of placebo effect, then you built some muscle and were able to hang onto it - but unless you did some good body composition tests, I wouldn't be too quick to attribute the gain to lean muscle, and that lean muscle to Hardcore.