It was something of a blast from the past to see this pastoral staff, which I thought had been relegated to some store-room in the Vatican. It belonged first to Pope Paul VI. and was used by his successors until Pope Benedict changed it for another. Historically, Popes never carried croziers, and only occasionally a triple-barred cross; no doubt Paul VI felt the lack of something in his hand. Neither the cross of Paul VI nor that of Benedict were historical: I'd prefer if both were quietly dropped.
The occasion for this cross's sudden reappearance was the dedication of a large slab of the square outside the basilica of St John Lateran to the memory of Papa Wojtyla; no doubt its use suggested itself to Papa Bergoglio as being appropriate for the occasion.