Technically they could throw Anderson in there and he's a second year guy.
Pedantry aside... I mean, yeah, this bit matters too. But does it matter enough to carry 10 guys? Are they going to drop a young kid they like to keep him around? And I know they said Herbig was the guy they were thinking of playing C, just how much do they trust him because it's not like he's got a bunch of experience.
edit: Also, while the Steelers aren't up against the cap, that 4m (after dead cap) could really make a difference in terms of who they get in the last bit of FA.