For context, only seven running backs in the NFL broke 1,000 rushing yards last year, and that's with the extra regular season game. One of those was Zeke and he had 1,002 yards. The Bills are very likely to be a pass-heavy team again, and between the known RB committee, and risk of injury in general from the RB position, it's highly unlikely that Singletary gets enough volume and/or is efficient enough to break the 1,000 yard mark. Is it possible? Of course. Just don't bet on it.