Yes. And he or she may also completely suck at new position. And also, if you have one superstar surrounded by weak people, someone is already doing bad job.

But, worst performed (which is not same as normal average performer) is very likely to suck at leading the thing he or she was unable to learn. Or unwilling to learn. If it is latter, you can expect unwillingness to learn new position too.

Of course, revolutionary idea would be to identify traits that are necessary for new position and look for those.