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Andrew Tiller to start at right guard vs. Cardinals, Arik Armstead at RDE

The San Francisco 49ers will make some adjustments to their starting lineup this Sunday, reflecting changes we saw last week against the Seattle Seahawks. It is no surprise that Andrew Tiller will be starting at right guard, and Arik Armstead will be starting at right defensive end in the 49ers base 3-4 defense. writer Ryan Sakamoto spoke with the players on Wednesday and got that confirmation.

Tiller played every snap this past weekend against Seattle, but for some reason was not listed as the new starter at right guard. It seems like it will be formalized to whatever extent this Sunday. Pro Football Focus graded him out at +0.4 against Seattle. He has graded out OK this season, and while he still has plenty to work on, he has been significantly better than Jordan Devey.

Quinton Dial told Sakamoto he will be moving to left defensive end in place of Glenn Dorsey, and Armstead will be moving in at right defensive end. Tony Jerod-Eddie is a depth option as well, but it appears the 49ers 2015 first round pick will get the starting nod, likely for the rest of the season. PFF graded him out at +2.6 in pass rush on Sunday, crediting him with a hit and four hurries in 21 pass rushes. He has consistently ranked among the top 3-4 defensive lineman in PFF's pass rush efficiency stats. The key now will be seeing how he does with regular work against the run, and not just in passing situations.