A competent glider CFI is one who has the ability to instruct to PTS
private and commercial standards.

If you believe that, you have some mighty low standards of competence.

If that's all you're looking for from an instructor, I can take any
halfway competent glider pilot (meaning one who can safely fly circles
around the home field - no XC competence necessary) and make him into a
CFIG in a weekend.

Michael