For the first time since Ferguson left his position in May 2013, United have ended a weekend at the top of the table. At the end of September 2013 under David Moyes, United languished in 12th position, eight points adrift of the leaders. A year ago, as Van Gaal took his first faltering steps in the job, United were seventh but once again eight points behind the pacesetters.
A one-point lead now is promising, but any United supporters who risk becoming intoxicated by their current position should perhaps wait until the end of October before planning a party in May.
Three away games, at Arsenal, Everton and Crystal Palace, will measure United's progress, while the one home league fixture next month - against Manchester City - will arguably provide the litmus test of their credentials.
If it proves to be a red October, United will legitimately be considered as title contenders, but for Van Gaal the only issue is the ongoing development of his team.
"We have a good team, but we can win and lose," the manager said. "You need luck, but I don't have to wait until October [to judge our quality]. Next week we have Arsenal away and I think it is one of the most difficult teams to beat in the Premier League, but we won there last year, so it is possible. I think that Manchester United can win against every team, but you need also luck."
While Sunderland's desperate lack of quality cannot be discounted, the sense of this being a United team on the rise is difficult to ignore. David de Gea's presence in goal gives United solidity and assurance, while Daley Blind's reading of the game and Chris Smalling's blossoming confidence have seen an impressive central defensive partnership emerge in recent weeks.