McGuire was a skinny kid when he came up.   Linebacker ..LOL.  You don't know anything about baseball my friend.
McGuire had the physical symptoms of steroid use- acne (at 37 years of age), hair loss etc..  If you think he wan't juicing- your a fool.
Nobdy hits 70 hr's without chemical help.  Sorry.
"If your not cheating- your not trying"-Yogi Bera