By scanning a Fox or Falco amiibo in Star Fox Zero, the Arwings and Walkers will be swapped out with 16-bit era models as seen in Star Fox and Star Fox 2. The old Arwing model's Charge shot does not lock on to targets, which reflects how they did not have a lock-on feature in Star Fox, but only in Star Fox 2 did they have a Charge shot. At the time of Star Fox Zero's release in 2016, Star Fox 2 remained unreleased, with only leaked beta builds being available, including one that allowed you to lock on to enemies with the Charge shot. The game would eventually be completed by Nintendo and released in 2017, but with this lock-on feature removed. Since Nintendo only showed Star Fox 2 to developers actively working on the series, it's believed that PlatinumGames noticed this feature's removal and referenced it in Star Fox Zero over a year before the game's release by making the old Arwings behave accurately to a version of Star Fox 2 that players did not know about.