Based on what I heard when I spoke to the guy who does the Rangers, he wasn't sure how exactly it was going to be done. I'd have to imagine, given the option, he'd prefer to do his own lettering, because with the arch the Rangers use, a letter L in one place on one name will look different than the same letter in a different place on a different name, and if a player gets called up last minute there's no way he'd be able to get a jersey ready in time if he needs to wait for Adidas to send him lettering for a new player.