Why did Kauravas and Paandavas considered Drona as their Guru?
What made them to consider Drona as a Guru?
Once all princes of Hastinapur are playing with ball and eventually the ball felt in a well. They tried to recover it from well but didn't succeed. There came a Brahmana and recovered that ball by using grass as weapon.
"Then the illustrious Drona, taking a bow with an arrow, pierced the ring with that arrow and brought it up at once. And taking the ring thus brought up from the well still pierced with his arrow, he coolly gave it to the astonished princes.
Thus all the prices were amazed by the power of Drona and they told this event to Bhishma. Bhishma instantly recognized that only Drona can do this. Then, Bhishma came there and asked Drona the cause of his arrival. And then Drona narrated all the story about His and Drupad's incident where later has insulted Drona for his poverty. And thus, Drona wanted to have great pupils so that he can take revenge to Drupada.
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