Maybe it's not wrong maybe is, but srsl when on 25man u r using 13 druids (if i recall all dpsers druids were ferals) coz they have bugged mechanic on that particular boss (nefarian hc - and i don't know for sure if it was bug or miscalculated and overlooked mechanic but i don't think it was intentional from blizzard side) it don't look right atleast for me (little exploit alert imho) - btw they got tons of dps from it which helped them a lot to kill that boss faster then others (but i must admit i respect that they can discover some let's say tricks like that one or using sorrowsong - 346 caster dps trinket - on ragnaros, same was on first kills of ascendant council - stacking casters/ranged dpsers).
OT: I don't know how they are doing but i'm assuming they are just fine as always
and btw they did what was allowed by blizzard, transfer tool is for everyone they just used it wisely to their advantage it's blizz fail imho (they didn't think about that option earlier)