How does Kai lose Dranzer in Beyblade G Revolution?

Kai loses Dranzer in G Revolution because he is beaten in the match against Zeo, who takes Dranzer upon his victory. However, Dranzer is later returned to Kai by Tyson, when he beats Zeo in the finals.

Actually Kai's Beyblade falls apart after his match with Brooklyn in G-Revolution, and it seems that Dranzer is gone (Kai says "You're free"). However, it is seen that Dranzer is back with Kai in the last promised-friendly-match with Tyson.