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Skye,
In terms of weight he probably only 25% grown and in a set of feathers that is not yet adult. He is far from being a rooster in respect to behavior. Presently, he is the larger chick that more likely than not is behaving in a selfish manner by picking in flockmates.
True rooster behavior will not be realized until he is 20 weeks or better and it is from that point mellowing will occur. With my birds that are significantly slower to mature, full adult behavior not realized until a good 32 weeks of age and even then with roosters, usually some futher mellowing expected.
Give him time.