Picard clearly misjudged the opposition. Who takes on a comedian in a battle of witty banter and trading insults? Especially one who lots of folks have a fondness for and more recently has been seen using his talents for raising money for charity and is gonna do an England World Cup song. You don't target someone who's got that level of popularity. Picard must have been out of the country for a while to have missed the fact that although James Corden may be little known outside of these shores, he is well regarded.