No need to have 'black and White thinking' : the path is gradual, the goal is gradually developed, and there is culmination of that path and that goal is fully realised- yes, it does include an aha moment at the point of culmination ( otherwise how would you know you are finished)?
Dwelling alone, secluded, heedful, ardent, & resolute, he in no long time reached & remained in the supreme goal of the holy life for which clansmen rightly go forth from home into homelessness, knowing & realizing it for himself in the here & now. He knew: "Birth is ended, the holy life fulfilled, the task done. There is nothing further for the sake of this world." And thus Ven. Sona became another one of the arahants.