As to #1, I can think of two possibilities:
1) You can't see the R5 eligible players from your own team, so in that respect, all 32 teams have a slightly different view of the R5 players.
2) Everybody has the ability to set their R5 lists with different position targets, weights and player types. As you make changes to these variables, your R5 list will be reordered. Since you can only see the top 500 players, it's possible you can have two owners with different R5 settings, one of whom will see a particular player in his top 500, and one who will not because he's beyond the top 500.