We did Sandstone Drakes on Mythic Mannoroth, much to the raidleaders dismay. But we had fun with that.
As for mount drop, its listed in the journal as an LFR drop akin to the Charhound from Antorus and the Eel from Tomb of Sargeras, would estimate around a 1-2% drop as normally is with these mounts.
Well, a kill is a kill, if you guys manage to down the boss while having fun, i dont see any harm ^^.
And yeah, i love the idea that LFR can have something nice aswell, cant say i used my army of alt to farm the fire hound from antorus, i was merely farming the transmorg set on LFR to get the achi for having the whole set, when the mount then dropped for me ^^.
It does drop in LFR, however the dungeon journal shows that in LFR it drops from Jaina. Looks like they’ve finally found a way to stop people queuing for the wing and bailing after the first boss.