Sorry to crush abit of your hate against Ensidia for being uber nerds but.
The double JoL is definatly a meerly cosmetic bug explained by statics from an exodus run were they tried to time them down. Either they failed to do that or the window or timelimit is impossible cause JoL showed to have around the same healing as in all other raids made by big guilds.
The Vashj kill was not reported to bug in the same way your describing it. It did all of a suddenly after phase 2 drop to 10% in health which after they pwned her and she decided to respawn. '
The hodir was idd impossible at that time, it was calculated that every raid member should produce 12k dps with 2 healers and a tank. They do idd acknolegde the use of flower power, but since it invovles the use of spellsteal which after all is a tricky spell too determin were or not its use of a bug og clever use of game mechanics. Normally its called clever use of Game mechanics due to the fact how would you know you shouldn't be spellstealing a certain buff?.
sources: Ensidia double JoL exploit on mimiron - Ensidia
Exodus Banned For Exploiting - Ensidia