Rico is also throwing out a data point without any context. Did his raid leader obtain any of his legendaries prior to the hotfix on September 15th (
https://worldofwarcraft.com/en-us/news/20252902/) that allowed you to obtain legendaries more frequently if you already had one?
My guild did another Mythic full clear last night of EN and we're holding steady at the 4 legendary soft-cap. Assuming activity levels are constant from player to player, the number of legendaries you see in a group should be a
normal distribution. What myself and many are observing is that it's not at all - something "happens" when you hit 4 legendaries that makes it more difficult to obtain #5 (right now)