Griner was raw as a frosh player, but often dominant.
Cox was rarely dominant as a freshman.
Cox has played with teammates who as a group have been better than those who played with Griner, though she and Sims were far and away the two best players on any one team in the collegiate game.
John Wooden was once asked to comment on his best player in his time at UCLA, the idea being that it had to be either Lew Alcindor or Bill Walton. Wooden replied, "Lewis was the most valuable player I ever had. I did not say that he was the best, only that he was the most valuable."
Evaluating a player through comparisons is fun-time speculation, sure to stir up controversy. It is not very fruitful, however, of certain conclusions, no matter the sport we choose as a starting point. Context in sport, as in so much else in the course of human affairs, leads to qualification and accusations of hedging the answer. It is particularly pernicious when it involves figures from the same program.
I recall a story I heard many years ago involving Mike Singletary. He is supposed to have asked a long time coach in the Chicago Bear organization whether he had not surpassed Dick Butkus as the best middle linebacker in the history of the franchise. The coach did not want to answer the question and Singletary went away unappeased.
Butkus was the most feared linebacker of his era, the only foe that O.J. Simpson admitted that he could not look across the line of scrimmage at because of the reaction that he had when he looked into his eyes. So my answer to Singletary might have echoed that of Wooden, and Mike may have been more valuable, but that was not the same thing as saying that he was the best.