Just one small problem. Luisi is booked to conduct Aida at Covent Garden on those two nights.
Now Luisi is not known for his Wagner. And until he dumped the ROH, he wasn't free either. In other words, there were more obvious candidates available. So Luisi's last minute step into the breach should be viewed as an auspicious one by Met-watchers. What it means for his future at Covent Garden is probably the last thing on his mind, given his form.