Arjuna thinks that he is such a big-shot that he says in the beginning that he will not feel happy even if he gets the sovereignity over the 3 worlds, much less over earth, seeing his kinsmen killed. While Arjuna does have a pure heart, he is not just interested in Moksha. Being the best archer in the world and a prince, he thinks...why should I lower down to the cowherd Krishna? He thinks...this Krishna sure does have some bag of tricks with him and if I can get something out of it, then I will be great both materially and spiritually. He also knows that he is screwed and trusts that Krishna will not cheat him. So he surrenders name-sake at first. When Krishna finishes all the sermon where He gives all the wisdom He has out of compassion for him, He knows that Arjuna's ego needs to be reigned in. So what He does is...He changes "Tham Eva Sharanam Gacha" in BG 18:62 to "Maam Yekam Sharanam Vraja" in BG 18:66. There cannot be 2 Dons in the same family at the same time. The next in line has to wait till the present one drops down. Courtesy: Godfather Trilogy.

Today we see the same thing among westerners who come to Indian Gurus for a closely guarded spiritual secret but go around calling India as a third-world country.