I was wondering if anybody knew what the law (or its interpreters) say in the following scenario:

FAA 117 ops: The PIC is acclimated, the FO is not. They have now different FDP limits. Due to delays the FO needs an extension of the FDP limit prior to T/O. If the company and PIC agree (and the rest of the crew is not fatigued), up to 2 hours can be extended. Does the whole crew need 30 hours of rest before both their FDP limits can extended again or just the FO's? Can the PIC be extended again (before the 30h rest) as his original FDP limit was not exceeded?

Thank you.