Mounts and legacy loot

[Hardstyle-burning-legion]

Mount drop chance difference between running solo and in group?

One in game friend didnt invite me on his dragon soul run because he says I am going to share the 1% chance of the mount drop. I thought the 1% was for each person but he says since its legacy raid that we get all the loot shared for 2 of us the mount drop chance is shared for 2 people as well because its not personal loot. Is he right? If he is, should i do all my mount runs for old dungeons and raids alone instead of another friend? Does this rule apply only for legacy loot raids and dungeo…