I usually go by what's on the teams official site...
https://www.neworleanssaints.com/team/depth-chart
Edit: Found the rule:
DEPTH CHARTS – Every team must produce a credible weekly depth chart for the media beginning no later than the week of its first preseason game and updated weekly through the end of its season. The depth chart must include the 11 offensive positions and the 11 defensive positions a team considers to be in its base units, and it must list expected starters and backups at each of those positions. Listing players at each position on the depth chart in alphabetical order is prohibited.
https://operations.nfl.com/media/3176/2018-nfl-media-access-policy.pdf