It's a third round pick Lou. The chances of these players panning out are slim but good Guards tend to fall. For some reason they have lesser value than other positions. Apparently, the Steelers feel the same. Zinter is coming off an injury too. Maybe he wasn't playing at 100%?
Right now, Bitonio is 32 years old and has a bad knee. The backups are Dawson Deaton, Michael Dunn and I guess we can throw in Wypler who is a Center by trade. They signed Germain Ifedi who is 29 years old and seems like a backup camp body atm.
I'd rather insert Zinter if Bitonio's knee goes to shit and keep Dunn & Deaton as backups. That is their role.