But after three days of practices, one tackle may have made a move into the top 10.
Eric Fisher of Central Michigan was labeled a mid-to-late first-round pick by many analysts heading into the Senior Bowl. Now there are some who have him rated ahead of Texas A&M's Luke Joeckel, ranked by some as the top overall prospect in the draft.
"I think he's made more movement than anybody in the draft," NFL Network analyst Mike Mayock said. "When you look at Fisher, he's a guy a lot of people thought was kind of a mid-to-late first-rounder coming out of the MAC. He came out here, and he stoned everybody. Now there are conversations about who's the first tackle in the draft."
Joeckel, a junior, is still rated by many draft services as the top tackle. CBSSports.com has him slated to go No. 1 overall to the Kansas City Chiefs in its mock draft. But Fisher has been so impressive that two NFL scouts said they had him slotted ahead of the 6-foot-6, 310-pound Joeckel.
"I've seen him play - he's a very good tackle," Fisher said of Joeckel. "I'm looking forward to battling him in these next couple months, preparing for this."
Fisher said he met with the Eagles this week, although that hardly signifies any great interest. But coach Chip Kelly and general manager Howie Roseman will likely consider addressing the offensive line early in the draft, even if Peters, Herremans, and center Jason Kelce return to their old form.
If they do, and left guard Evan Mathis maintains last season's solid play, the Eagles should be fine. But that was the expectation last offseason, before the injuries, and the Eagles were ill-equipped to handle the losses.
Add another year to those legs - Mathis will be 32 in November - and the line is an aging group. Fisher or Joeckel, even if they didn't start right away, would give the unit some high-end youth.
Both have the skill sets to start right away. The Eagles, if they took either, could move Herremans back to his natural left guard, slide Mathis to right guard, and start a rookie at right tackle.
Fisher started at left tackle for four seasons. He said he played a few games at right tackle and right guard during his sophomore season.
"From a skill-set prospective, he fits the left side more than he does the right," Mayock said. "He's a natural pass protector. Not as good a drive blocker, but he can drive block. But two years ago, Jason Peters was the best left tackle in football. So you've got to make some decisions on where Jason Peters is going to be. The Eagles are sitting at four, and I'm a big believer that at four you get an all-pro."
With each year there are fewer concerns about prospects that do not play in the big conferences. But Fisher, who played in the Mid-American Conference, said he had something to prove this week going up against defensive ends like Alex Okafor of Texas.
The San Francisco 49ers' Joe Staley faced the same uncertainty when he came out of Central Michigan six years ago. The two-time Pro Bowl tackle had a strong Senior Bowl week and was selected with the 28th overall pick in 2007.
"I remember walking in when I was being recruited at Central Michigan and saw his pictures, a first-rounder, on the wall," Fisher said. "I was like, 'That's who I want to be. I want to follow in his footsteps.' "
The other issue with Fisher is his size. His measurements at Monday's weigh-in were 6-foot-7, 304 pounds. He has always struggled to keep weight. But scouts see his frame, and with the NFL's strength programs, believe he won't have any problem adding pounds.
"He's got the frame that he could put on 20 pounds naturally without losing any of his quickness or footwork," Mayock said. "I think what you're looking for, first and foremost, in a left tackle is the ability to protect your passer. He looks a little bit to me on tape like Joe Staley. But the more I see of him the more I like him better than Staley when he came out."
Contact Jeff McLane at email@example.com, or follow on Twitter @Jeff_McLane.