Board Thread:Suggestions/@comment-33977417-20180726173002/@comment-5846800-20180726223645

Terraspin is useful because he has a far greater set of powers, including hiding in his shell, as far as I'm concerned.

As for Shellhead, like EnderJesse said, was intended for defense and in the Ken 10 episode it was stated his only power was hiding in his shell.

Point being Terrasping can do far more than hide in his shell.