Guru Gobind Singh Ji and Madho Das

We've all most likely heard the story of Guru Gobind Singh Ji meeting Madho Das (later to be known as Banda Singh Bahadur) at Nanded. We have probably heard the sakhi where Guru Ji enters Madho Das's hut whilst he is away, and Guru Ji and his followers cook some food. Madho Das returns and is furious, and tries to use his powers to overthrow Guru Ji from his couch. When this did not work the following dialogue ensues (some people may have heard a slightly different version)

Guru Gobind Singh: "He whom you know full well."

Madho Das: "What do I know?"

Guru Gobind Singh: "Think it over and you will understand."

Madho Das: "I have seen you many a time in my dreams. Are you Guru Gobind Singh?"

Guru Gobind Singh: "Yes. I have come to receive the blessings of a Holy man like you."

Madho Das: "My Lord, I would sacrifice myself a hundred thousand times for you. How grateful I am that you have sanctified my hut with your lotus-feet. Lord, my pride is gone, my power has vanished. I know not what to say. Kindly accept me as your Banda (slave)."

Now whilst reading through a book by Sant Niranjan Singh (divine mystic reflections on Gurmat), i came upon a sakhi which tells this event as follows:

Guru Ji asks Madho where his master/guru is. Madho Das replies that his guru (Sadho Das) is in sachkhand. Guru Ji then instructed Madho Das to pick a fruit from a nearby tree and cut it open. There is an insect in the fruit, and Guru Ji gave it the power to speak, and asks it who it is. The insect replied that it was Sadho Das. At this point Madho Das bowed before the true Guru, and became his follower.