The orb of MC gave the debuff to other members rather than only the one who just MC'd. (couldn't reproduce at will, still trying to figure out).
When the first wave of NPCs is wiped, more adds keep spawning but they stand idle on their spawn location and will not engage either the tamed boss or the raid.
Attacking the untamed boss adds the whole aforementioned room of adds.
"Destroy Egg" spell of Razorgore appears to have a shorter cooldown than showed by its tooltip/visual
Killing razorgore prematurely does not reset the event, does not wipe the raid, does not open the first door, but the waves of adds keep spawning. Basically the even can't be reset unless zoning out/in. NOTE razorgore is 100% lootable when killed prematurely. This might lead to exploiting.
EDIT zoning out/in after the boss dies prematurely does not prevent the mobs to keep spawning and engaging, even in Vael's room.