Second, Bonds hit 37 HRs in the strike shortened 1994 season and was on pace to hit in the mid-50's while he was also a skinny rail.
The dillution of pitching due to expansion has as much to do with increased home run totals as anything. The same thing happened in the early 1960's when baseball expanded.
I have though of that and WHILE I AGREE it EXITS and that it is the reason for INCREASED HR output that DOES NOT explain BB hitting 74 in ONE year and NEVER even 50 any other. The dilution of pitching has been existent for years. Also see my previous post concerning INJURIES preventing something from happening.
I really don't KNOW if BB or MM were/are on steroids or if all MLB players are, I believe it to be a factor but NOT one that will answer my question.
You're really downplaying the difference between 49 and 70, when no one had hit 60 in 40 years. I think steroid use "had big factor" with McGwire. (and Sosa and Bonds, as well)