Group Composition

[MiRai]

I'm pretty sure I saw M+6 posts from 5 hunters (or was it 4 hunters 1 healer? but no tank I'm sure)

Not to lessen the achievements of others who are trying to push Mythics with same-class teams, but a +6 key does not qualify as "the highest keys" when you have mixed-class teams pushing +9/10/11. For multiboxers, there's a large ramp up in difficulty around those key levels, and an additional affix at level 10.