Considering that Picard was violating orders just by being there, how was he able to take command of the fleet so easily? His own crew thought the order keeping him away was bullshit; did the rest of the fleet think so too?
On a related note, why didn't Starfleet transfer Picard off the Enterpise and send it into battle under Riker's command? Riker is, after all, the only Starfleet officer in the Alpha Quadrant who has ever commanded a starship in a confrontation against the Borg and won. (Unless you count Archer, but my guess is that he's no longer active in Starfleet. Did anybody in the 24th century ever try omicron radiation?)