If you look at the period when Lee played his stats are a little less impressive. Same with Gibson... they both pitched during a very dominant pitching era. Not trying to take anything away from either of them of course.
Do you mean Koufax?
'65 Twins were second in team batting*, though the Reds were going away #1. Still, with 3 top 30 hitters - Versailles, Oliva, and Killebrew, this was a strong lineup to face.
*Based on MLVr. MLVr is a rate-based version of Marginal Lineup Value (MLV), a measure of offensive production created by David Tate and further developed by Keith Woolner. MLV is an estimate of the additional number of runs a given player will contribute to a lineup that otherwise consists of average offensive performers.