Parsons and Gross-Matos were named to the Bednarik Award's watch list, and Hamler earned a spot on the Maxwell Award preseason list.
Johnson is the first recruit to join Pat Chambers' class of 2020.
At 91 overall, Saquon Barkley is the highest-rated former Nittany Lion in this year's edition of the popular "Madden NFL" video game.
Gould signed a two-year, fully guaranteed $10.5 million contract with a two-year option clause the 49ers can pick up before the end of the 2020 season.
Killens previously officiated in the American Athletic Conference and the former Alliance of American Football.