Not only that, but the PlayStation 4 exclusive sold fewer copies in its week of release than Dead Rising 4 did just via its physical Xbox One release.
UK numbers company Chart-Track does not count digital downloads. There are no physical PC copies recorded sold of Dead Rising 4, (EDIT: which, we should point out, launched last Tuesday compared to The Last Guardian's Friday release - meaning it had another few days on sale).
http://www.eurogamer.net/articles/2016-12-12-dead-rising-4-outsold-the-last-guardianOne happier note for The Last Guardian - it outsold the first week sales of Ico and Shadow of the Colossus, the two earlier games from creator Fumito Ueda.