John 20:8

Then entered in therefore the other disciple also, who came first to the tomb, and he saw, and believed.

This is the climax of the whole paragraph regarding fine cloths. It resulted in John's everlasting faith that Jesus had risen from the dead. There were three elements of this convincing sign: the open grave, the absence of the body, and the undisturbed linen cloths. As for the reason why the stone was removed (supernaturally), it cannot be viewed as a means of letting the Lord out, but as a means of letting his disciples in for the purpose of beholding and being convinced of his resurrection.