OP - are you a legit 10% or are you 'looking in the mirror and guesstimating' 10%? If you are a legit 10% at 205, you will have a visible six pack and most likely would know enough about training to not have to ask this question.
To everyone else nitpicking about the 1lb a week thing - when you gain weight, essentially the only things that are changing are fat, muscle, and water weight. 1lb a week is not out of the ordinary. Usually half of that or more will be fat though. Unless someone's water weight is changing drastically (which isn't normal, but can definitely happen), 1lb a week of LBM is freakish. I'm guessing that the OP gained 4lbs in a month and wrongly assumed that all of that was muscle. Considering that he says he's using creatine off and on, water weight could have something to do with it too.
People who gain X amount of weight in Y amount of time without any noticeable fat gain like to say, "I gained X amount of muscle in Y amount of time." This, of course, isn't true and half (or more) of that is probably fat.