I agree with you different eras. Also, Sowell is living in pre-sabermetrics era. I would rate Marichal and Koufax ahead of Gibson, although Gibson’s 1968 season was the greatest season ever by a pitcher.
It was great indeed. Mrs jimfree was in HS in St Louis that glorious year. As a straight A student she got comp tickets from time to time and went with her Dad to see some Cardinals. I don’t remember if she actually saw a Series game in 68 but I believe she saw Gibson perform. I’ll have to ask her this evening.