Really whether the batch code shows the bat was produced during or before spring training is irrelevant. Just because a bat was ordered early in the year doesn't mean it wasn't used later in the season. I've seen multiple times where a player used bats dated from previous seasons a year or 2 years (or more) later. And these were some pretty big names too. For some reason PSA frowns on that and gives a lesser grade which I will never understand why..... Bats get ordered and put in the equipment room and subsequent orders come in and everything gets mixed together. Miguel Cabrera was using 2014 bats during the first part of the 2015 season, so it happens all the time.