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49ers vs. Chargers film review: The struggles of Iupati

Mike Iupati struggled in pass protection
Mike Iupati struggled in pass protection
Photo by Thearon W. Henderson/Getty Images

Here are some extra notes from Sunday's 21-7 exhibition win against the San Diego Chargers:

-First off, the explanation for Mike Iupati's problems on Sunday was the result of Corey Liuget dominating the 49ers offensive line. The one play that stood out the most was the sack-fumble allowed in the first quarter where Liuget slipped by the starting LG. Iupati over-committed when approaching Liuget and wouldn't lower his body. His aggressiveness backfired and the Chargers had open paths to the 49ers backfield.

-Alex Boone, who has been holding out in hopes of a new contract was hoping for Joe Looney to struggle so he would have leverage. It ended up being Looney and not Iupati who played well at guard in pass protection and RT Jonathan Martin helped him on the right side of the offensive line.

-The second-team offense looked better which was reflected on the Blaine Gabbert touchdown pass to Vance McDonald. However, several first-team offensive linemen were protecting Gabbert, therefore giving the quarterback plenty of time to see the field. The real story was McDonald making plays on the drive, where he had three receptions for 29 yards including the TD with no drops.

-Michael Wilhoite all but secured his spot as the starting ILB in Week 1 alongside Patrick Willis. He wasn't the greatest in coverage, especially on Antonio Gates, but he did his job at stopping the run. His experience with Vic Fangio's defense should give him the edge over Chris Borland when the depth chart is made. It wasn't a great outing by any means, but it was adequate enough as he fills in for NaVorro Bowman.

-Ian Williams only played 11 snaps on Sunday, but he did his job at nose tackle and it appears he is ready after missing most of the 2013 season with an ankle injury. The 49ers patience to wait until he was ready appears to be paying off.

-LaMichael James was horrid in the running game which is summed up by his long run to the sideline for a minimal gain. However, he had a decent day as a pass protector which helped buy time for a few passes.

-Aaron Lynch was impressive against the third-string Chargers offense where he showed flashes of being a pass rusher in the future. He is a little raw, but with time he could be a situational pass rusher down the line. Lynch also contributed to the interception by Jimmie Ward with the tipped ball.

-Shayne Skov was also a reason why the 49ers shut out the Chargers in the second half. The former Stanford LB was everywhere on the field, but his odds of making the 49ers 53-man roster are slim. It's very possible that he secured a 53-man roster spot on another team when the roster is trimmed. He would have to clear waivers in order to be signed to the practice squad.

-It was preseason, but that didn't stop Mike McCoy nor Jim Harbaugh from throwing their challenge flag on plays that they thought could be overturned. Harbaugh was 0-2 while McCoy was 0-1 in their respective challenges and there was another booth review on the interception by Ward. Coaches throughout the NFL aren't scared to stick their nose out on plays they think were close and it won't be surprising if they remain aggressive on this.