The NFL has changed its jersey number designation rules again, just a year after the first big shakeup in years. The single-digit No. 0 will be eligible for select players on offense and defense as well as some specialists for the 2023 season, but who should be wearing it for the New Orleans Saints? Here’s the list of positions eligible for No. 0: Quarterbacks Punters Kickers Running backs Fullbacks Tight ends Wide receivers Linebackers Defensive backs We can probably rule out established veterans in signature numbers like Alvin Kamara, Taysom Hill, Michael Thomas, Demario Davis, Marshon Lattimore, and Tyrann Mathieu,…