"The next 10 sectors are done with the new capt in the left seat with a senior and experienced FO in the right seat and a training captain on the jump seat as Commander still." [my italics]
As llanfairpg says, surely the guy in the jump seat can not be in command? Does the PIC not need to be at the controls? (with the exception of rest periods, obviously).
Second follow-up question, if I may: where do CAA examiners fit into all this?