The Los Angeles Chargers open 2020 NFL training camp July 28 at Chargers Hoag Performance Center in Costa Mesa, California. Here's a closer look at a few storylines:

Is there a QB competition with Tyrod Taylor and No. 1 draft pick Justin Herbert?

Chargers coach Anthony Lynn emphasizes competition in every position group, including quarterback.

But Lynn says Taylor, who he coached for two seasons with the Buffalo Bills, is in the driver's seat.

"I'm very familiar with Tyrod," Lynn said. "But no position is final until we get to training camp right now."

A 10th-year pro, Taylor has spent most of his career as a backup but did start three seasons with the Bills, leading them to a playoff appearance in 2017. In 43 starts, Taylor has a 62.6 completion percentage and has thrown 51 touchdowns, with 16 interceptions.

The No. 6 overall pick in the NFL draft, Herbert faces an uphill challenge to win the starting job after an unusual virtual offseason program that prohibited the rookie -- and his teammates -- from taking the practice field.

"We drafted him high to one day be our franchise quarterback, for sure," Lynn said. "But I don't want to put a timetable on this young man."

How will the Chargers' offensive scheme change without Philip Rivers?

The Chargers' offense will evolve this season as it moves on from the pocket-passing Rivers. Taylor provides a mobile option, as does Herbert. The Chargers also have recently emphasized speed at the skill positions.

Lynn says to expect more movement, plays that originate under center, some play-action and some scheme changes.

"It's a mobile group that allow you, I think, to open your offense up and do some different things," Lynn said. "They put pressure on the defense in a different way than before."

The Chargers promoted Shane Steichen to offensive coordinator last season after firing Ken Whisenhunt. Steichen retained the role and says he's eager to implement the virtual installs from the offseason.

"We're putting in a new system, but you got to go rep it," Steichen said. "There will be some similarities to what we've done and there's going to be some wrinkles, too."

Who will win the starting job at left tackle?

The Chargers revamped their offensive line during the offseason by trading for right guard Trai Turner and signing right tackle Bryan Bulaga to a three-year, $30 million contract in free agency. Center Mike Pouncey is on track to return after he was placed on injured reserve because of a neck issue last season.

But the Chargers did not address -- in free agency or the draft -- left tackle.

"We have some people in-house that we like," Chargers general manager Tom Telesco said. "The offense is going to change a little bit for how we do some things. I think it's going to fit a little better with some of the guys that we have."

Sam Tevi and Trey Pipkins are the leading candidates. Trent Scott and Forrest Lamp also are under consideration.

"We've got guys over there that are going to compete," Steichen said.

Tevi, a fourth-year pro, started the last two seasons at right tackle. Pipkins, a second-year pro, started three games at left tackle as a rookie.

In a crowded secondary, what position will each star DB play?

The options in the secondary are plentiful, though positions might not be written in ink until deep into training camp.

Cornerbacks Mike Davis, Casey Hayward Jr. and Desmond King II return. Plus, the Chargers signed Chris Harris Jr. to a two-year, $17 million contract in free agency.

The Bolts also return safeties Rayshawn Jenkins, Derwin James and Nasir Adderley.

"We're excited about the guys," defensive coordinator Gus Bradley said. "We try to get guys in or draft guys that have versatility that can help us."

Harris says he can play outside or in the slot. King, who played in the slot last season, is likely to be moved around.

"We can put more on his plate as far as playing different positions," Bradley said.

James says he's comfortable at linebacker, in the slot or "anywhere on the field."

Bradley says he's excited about the possibility of subtle changes that will enable guys to make more plays, though he expressed uncertainty how it will pan out because of the virtual offseason program.

"We're proceeding like we can move guys around," Bradley said.

With a lack of depth at running back, who will provide relief for Austin Ekeler?

Lynn chuckled this offseason when a reporter suggested that the Chargers were stacked at running back.

"Did you just say we're loaded at the running back position?" Lynn said, smiling. "I love the running back room. I wouldn't necessarily say we're loaded, but I do like that room."

An undrafted free agent from Western State Colorado, Ekeler signed a new four-year, $24.5 million contract this offseason and will carry a bulk of the load.

But depth is a concern.

Justin Jackson returns for a third season but has struggled to remain healthy and available. In two seasons, he has rushed for 406 yards and two touchdowns on 79 carries.

The Chargers selected Joshua Kelley with a fourth-round pick, and the rookie will need to adapt quickly to the NFL despite missing on-field instruction this offseason.

Kelley began his college career at UC Davis before transferring to UCLA. In two seasons with the Bruins, Kelley rushed for 2,303 yards and 24 touchdowns on 454 carries, averaging 5.1 yards per carry.

"Justin Jackson has shown that he can play, he can move the chains, but Justin Jackson has got to stay on the football field, he's been out a lot," Lynn said. "Then bringing in this rookie, yeah I love Joshua, I love what he put on tape, I think he's gotten better every single year."