Disciples can never be an exact replica of their Master
Even if a father recognizes himself in his son, or a Master in his disciple, the son will never become his father and the disciple will never become his Master. No human being can replicate another exactly.
Each person has their path, their mission, and even if disciples model themselves on their Master they must always develop according to their own nature. To use an image, I will say that when they are singing they only have to do their best to keep to the score, but they cannot help but sing it with their own throat, their own voice, which is certainly not identical to their Master’s. But that does not matter: all that matters is that they follow the score, that is, that they conform to the only eternal, true philosophy, that of all the great Masters of humanity.