Yes he did put on a lot of mass but he was only 18 when a rookie.
The difference that I was pointing out was unlike Bonds, Sosa and Giambi it did not occur over one offseason. McGwire gradually got bigger. He could have used steroids to do so but it isn't as fishy if it takes him 3-5 years to get that big rather than 3-5 months as the case was with the others.
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