Zeo joins team HD because the director of the team promissed Zeo that Toby would get the best treatments if Zeo would join their team. According to Masamune, it's impressive to know that not only Zeo is improving on Beyblade, but even more impressinve is to know that he is on the best American team because Zeo was a weak blader. Later, Zeo tells he had to improve so he could make Toby get better. Besides, he became stronger also because of the Arrange System.
