Guardiola's influence at City has gone well beyond team sheets and touchline instructions. He built a side around positional control, technical precision and an expectation of dominance that became the club's default setting.
That is why succession matters so much. English football has seen what can happen when an era-defining manager leaves. Manchester United struggled to find stability after Sir Alex Ferguson, while Arsenal needed time to recalibrate after Arsene Wenger.
Reports suggest Enzo Maresca is expected to be the next man in line. The appeal is obvious. He appears to understand City's football language, the training-ground demands and the broader identity Guardiola embedded.
But continuity is not the same as authority.
That is the trap awaiting any successor. Taking over a superclub is one thing. Following the most influential coach of the modern Premier League era is another.
This is why the appointment could become City's most delicate modern decision. The club have the resources, the infrastructure and the players to stay near the top. What they cannot easily replace is Guardiola's grip on the institution.
Whatever happens against Aston Villa, the next storyline is bigger than the scoreline: whether Manchester City really are about to begin life after Pep Guardiola, and whether Maresca is the coach trusted to make that transition hold.