It was eye test stuff. Like I said, he couldn't play the wall in Wrigley even after 7 years there. He struggled to catch routine fly balls for a stretch.
UZR is a nice stat, but sometimes it also depends on the players around you. If the adjacent OF can take a lot of plays by covering part of your "zone," your UZR can suffer for it, as it's an in=zone play with no putout. Sort of like what we all watched Betts do to Bradley the last few years. So maybe Soriano, who did have some speed, leeched a few plays from his CF?
Remember, UZR is a comparison to average defenders. A bad player can look good if everyone else just sucks more....