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The Steelers like offensive linemen who are versatile. This year, it was practically a requirement because of the injuries and other issues faced by the line. Those issues aren't going away.
Willie Colon figures to be among the potential cap casualties, Max Starks is coming off an ACL injury and the rest of the line has questions about who should start and who should sit.
Potter is a versatile player who can play either guard or tackle. The team could conceivably slide him into the right tackle spot or left guard spot. If he's at tackle, Marcus Gilbert could move to the left tackle spot. If he's at guard, it would free up Doug Legursky to take over at right guard or go back to being a super-sub.
Just the depth he would provide would be welcomed, as the team is likely to get rid of Chris Kemoeatu this year after he's disappointed continuously since being drafted several years ago.