While the sidesticks aren't connected, that's not quite the whole picture since in normal operation the system sums the inputs; full up on one stick and full down on the other produces level flight (and also a "dual input" callout and a letter from the flight safety dept!) HP90's right to say that if the FO had pressed his takeover button it would have given him full control. But if the Capt subsequently pressed his, his sidestick regains authority.
Whoever resuscitated this thread from last year said the Capt "faces a court martial and perjury charges". Is this the case?