Not P but more of DFW's references

[Mike Jing]

>From DFW's How Tracy Austin Broke My Heart:

How many hours a night did the child Bird spend in his driveway hitting
jumpers under home-strung floodlights? What ungodly time did Bjorn get up
for practice every morning? What exact makes of cars did the Butkus boys
work out by pushing up and down Chicago streets? What did Palmer and Brett
and Payton and Evert have to give up?

Does the Brett here refer to George Brett of the Kansas City Royals? And Payton
to Walter Payton of the Chicago Bears?