Newsroom GuidelinesNews TipsContact UsReport an Error What that means for the Dodgers is new names in big roles, and familiar names in unfamiliar roles. Roberts said Thursday that Kiké Hernandez would be in the lineup every time a left-handed starter was on the mound. Hernandez got 87 plate appearances against left-handers all of last season.Newcomers Scott Kazmir and Kenta Maeda, the Dodgers’ biggest off-season free agent signings, aren’t simply here to eat innings at the back end of the rotation. They are the No. 2 and No. 3 starters, after three-time Cy Young winner Clayton Kershaw, effectively assuming the roles held last year by Zack Greinke and Anderson.And the roles will change.Ethier is expected back no earlier than May 27. Same with Ryu.Kendrick, Bolsinger, Beachy, Guerrero and Montas could still reasonably return sometime in April, with some beginning their seasons in Triple-A. The Dodgers would be happy to see Anderson and McCarthy sometime after the All-Star break.Then there are the prospects. Starting pitchers Julio Urias and Jose De Leon are healthy and waiting in the wings at Triple-A. Pitcher Yaisel Sierra isn’t really a prospect at 25 years old, but he’s coming back from more than a year-long layoff since his last inning in Cuba. His mechanics are raw and there’s no real timetable for his return to the majors. Whenever he arrives, Sierra can start or relieve.Behind the 25 men on their Opening Day roster, the Dodgers effectively have a stash of mid-season acquisitions waiting for their turn. The main question is when the reserves will arrive, and whether they’ll arrive in time to help. Zack Greinke is in Phoenix; Jeff Samardzija and Johnny Cueto are in San Francisco. Both the Diamondbacks and Giants are expected to improve after missing the playoffs last season, and the National League West has never sent three teams to the postseason.It’s already a season of change in Los Angeles, and the first game hasn’t even been played yet. The Dodgers will likely begin the regular season Monday with 10 players on the disabled list: Alex Guerrero, Howie Kendrick, Andre Ethier, Brett Anderson, Brandon McCarthy, Brandon Beachy, Mike Bolsinger, Frankie Montas, Josh Ravin and Hyun-Jin Ryu. Together the group will be paid more than $70 million this year.Their injuries were as cruel as they were random: a rib resection surgery here, a car accident there, foul tips and bad slides and bulging disks. It made for a long spring training full of deep breaths, heavy sighs, and reassurances from Andrew Friedman and Dave Roberts about the Dodgers’ mighty depth.“You’ve got to expect the unexpected,” Roberts said on one March morning outside the Dodgers’ spring training facility. “Whatever kind of trite statement you want to say.”Beginning the season with 10 players on the DL wasn’t how the manager drew it up — how’s that for a trite statement? — but maybe it should have been. By the time the calendar turns to May, the Dodgers will have played three games each against the Rockies and the Braves, four against the Marlins and five against the San Diego Padres. That’s 15 of the first 25 games against teams who missed the playoffs last season by a mile. There is a soft month in the Dodgers’ 2016 schedule, and it’s right at the beginning.The Dodgers’ depth was tested last year, too.About 64 percent of plate appearances went to the primary starter at each position, not including pitchers. That left 36 percent of all plate appearances (2,088 to be exact) to “everyone else” — utility players, backups, minor league call-ups, and others.On the mound, the Dodgers got 947 innings from the 11 pitchers listed on their 2015 Opening Day roster. “Everyone else” pitched 498 2/3 innings, about 34 percent of the total. So Friedman and company had to know the team’s depth would be tested even before the first injury hit. Looking at the schedule, the first month of the season might be the best time to test it.