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While this isn’t necessarily a glaring hole, it is something that badly needs some sorting out before the season opens.
Right now, the Steelers have Isaac Redman, Mewelde Moore, Jonathan Dwyer and Baron Batch as the most likely runners to make the roster. One of them, maybe two, will have to go before final rosters are decided.
Once someone (likely Dwyer at this point given his conditioning issues) goes, the roles still need to be defined. Redman could play some fullback if David Johnson takes on more of a role as the tight end. Moore will likely stay the third-down back. Batch has good versatility and has flashed some impressive blocking and power skills as well, so he could be some kind of gadget player.
Like I said, the players are already on the roster, the big need here is to figure out who goes and then figure out where everyone else fits in. Without a defined role, the runners will likely not be used properly or effectively behind starter Rashard Mendenhall.