I don't follow your logic, Raul, but a reread of the regs revealed 91.147 (a) uses the term "Operator), specifically defines "Operator", and restricts the definition to flights in an airplane or helicopter.

Subsections (b), (c), (d), and (e) clearly refer to "Operator" as defined in (a).

Conclusion, gliders are not subject to this FAR by definition of Operator.

One less problem to solve...

PA