Kongo naming politics for Japanese Aegis destroyers

Why was the name Kongo rejected for an earlier Japanese helicopter destroyer launch when it later appeared on the first large Aegis destroyers?

Political sensitivity and alliance management discouraged the earlier choice, while the name was being saved for the later Aegis destroyer program.

The Kongo name was politically sensitive while Japan was rebuilding its postwar naval capabilities. That process had to avoid unnecessarily alarming allied governments as well as potential opponents. The name was also being held for Japan's first large Aegis destroyers, a use planned well before those ships entered service. Its later adoption joined a famous name to a major step in Japanese fleet development.