Drona didnt take any gurudakshina

 We know that Drona rejected ekalavya as his disciple.And ekalavya started practicing Archery in the presence of Drona's statue.And he became as good as an archer as Arjuna.And we know the rest of the story also.Its not true that drona demanded ekalavya's thumb as gurudakshina.Drona and kauravas went on a hunting expedition,and there Drona found ekalavya who could shoot four arrows into the mouth of a dog.
Upon observing Mahabharata verses,I logically came to the conculsion that Drona didnt demand any gurudakshina from ekalavya.Firstly Drona didnt teach ekalavya.So Drona can't demand any gift from him.
That would be an evil act and a person of Drona's integrity wouldnt do it.He will loose his astra vidya if he does something like this.And ekalavya did not know any divyastras.He might have equalled Arjuna in archery but without the divyastras or divine weapons he cant be superior to Arjuna.Drona knew this.
Though Arjuna did complain first, drona has told him that he didnt teach him.And Arjuna also knows ekalavya cant equal him in other aspects.And There are so many other things that one should learn apart from shooting arrows to become a great bow wielder.So the question of drona demanding anything from ekalavya doest arise.Ekalavya still can be defeated if he is attacked by many warriors,and krishna's army has killed him.