49ers vs. Chargers: 3 studs, 3 duds

San Francisco 49ers’ Jeff Wilson Jr. (41) is congratulated by San Francisco 49ers’ C.J. Beathard (3) after scoring a touchdown against the Los Angeles Chargers in the first quarter of their NFL preseason game at Levi’s Stadium in Santa Clara, Calif. on Thursday, Aug. 29, 2019. (Jose Carlos Fajardo/Bay Area News Group)SANTA CLARA – Mainstays safely watched from the 49ers sideline as Thursday night’s exhibition finale afforded others a final audition to either be a stud or a dud. The nominees are:

THREE STUDS

1. Running back Jeff Wilson Jr.: Promoted from the practice squad last season, Wilson enhanced his roster bid with a 41-yard touchdown run late in the first quarter. Wilson cut back right…