Tow endorsement must include 3 glider flights as PIC?

Re the previous reply--

I always thought PIC was one of those concepts with more than one meaning.

For logbook purposes, I thought you had to have the appropriate rating for the aircraft in question.

Has something changed in this regard?

Do student pilots log PIC time?

On a more for practical level, would you allow someone who is not a glider pilot to be the sole manipulator of the controls in a glider? For the whole flight, takeoff to landing? How many prior flights would be needed to get him/her up to this point of proficiency?

Something is not adding up here...

S