Based on my admittedly limited observations, I'm of the opinion that Dwyer is more of an every-down back than Redman.  Dwyer was clearly below Redman on the depth-chart last season but there is a significant learning-curve in picking up blocking assignments and Dwyer was a full season behind.

If Mendenhall misses significant time (& it's looking like he might), don't be surprised if they come out of camp with Dwyer carrying the load n' Redman as a 3rd down/GL back.  This isn't etched in stone by any means, but it's a real possibility and one you should keep in mind when making plans for Steeler RBs.  Batch & Rainey will get a good looking over but no matter how well they do the current Steeler brass has never proven to be wowed by camp darlings (which both Redman & Dwyer were) in the past.