After looking into this a little bit more, I believe a player on the 40 man doesn't eliminate them from being a PTBNL. Including PTBNL is a way to have access to players on the 40 man if the said player they want wouldn't pass through waivers. I found this here... • If the player is on the 40, there are two reasons why he wouldn’t have been traded at the time — he has to pass through waivers, or he’s disabled. If he didn’t pass through waivers, both teams would simply wait until after the season, at which time the waiver period ends. The disabled list also ends after the season.