Well, I exported the roster and opened the Excel file, narrowing down all the player portrait ID numbers that are not used in game (it's not very many.) For the 4000s:
4958
4952
4913
4902
4868
4828
4816
4712
4533
4524
4519
4518
4460
I tried all those and didn't recognize anyone's face. A few looked familiar from old Madden games but nobody that stands out as a great that I'd even care to create. I stopped at 4400, so if you want to go lower go ahead. I doubt players like Montana and Elway have portraits saved on the disc, so I'm thinking about switching to Madden 13 (which I know both those guys are in that game, along with legends like Sanders, Rice, and Peyton from 12.)
I'm sure this has been discussed many times before, but can team rosters from Connected Careers Mode in 13 be edited successfully in the new editor? As well as all the coaches?