Generally, when somebody says that they would like to see a team run more two-back sets, they are not referring two one halfback and one fullback—that is, the sort of bulldozing fullback who very nearly exclusively serves only as a lead blocker. What they are usually referring to is a pair of running backs who can equally serve any role.
This is something that many hoped that the Pittsburgh Steelers would utilize over the past couple of years with Le’Veon Bell, first when they brought in LeGarrette Blount in 2014, and then particularly last season with the free agent signing of DeAngelo Williams.