Faulk is great at PR, and Hobbs is also great at KR, but I don't think that's what we are talking about here.
The issue is about risk, in generating injuries, while also considering the talent that would have to step up if certain players went down. I feel much more comfortable with our RB depth than I do our CB depth.
I agree that our best lineup possibly Faulk at PR and Hobbs at KR, but I do not think that is in the long term best interest of the team. You need to consider what would happen if Hobbs or Faulk were to get injured and who would replace them.
Maroney could take over Hobbs' duties, for example, and give a very similar output, while minimizing the risk that we would lose Hobbs.