Gaetjens was seen wearing 15 in the game against Spain, which was not the 18 he supposedly wore in the game against England. The Youtube video footage of the game against Spain was not just of high quality, but also a close up of him hustling back after a failed attack via a left side cross, thus showing the back and the number of his shirt clearly. On the other hand in the England game there was only a photo taken from the other end of the field (goalkeeper's view), so it is not 100% sure if indeed it is 18 or not after magnifying the photo.