What I saw was a report that Cordero's route running was "interesting." I've never seen anyone be listed as both outstanding and highly questionable in various reports. Hard to really make too much of it until we actually see it. For me, the amount of smoke stating that his defense may be an issue seems hard to ignore.
Maybe his instincts are poor but his speed makes up for it? According to Fangraphs, he has a below average arm, negative DRS and negative UZR/150.