The thread you linked actually mentions what he talks about in the video, the description is misleading.
Gargantuan - Wrathful Protector <--- Is the only thing that double dips (the thread you linked even says it quadruple dips)
As for all pets? absolutely not, its based on Witch Doctor position.
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Enrage timers add nothing to a boss fight....can you imagine actually fighting one of these 'bosses' in real life, and if you didn't defeat it in a man-made unit of time it suddenly bursts into flame, and destroys you? Its much more interesting when its, I can do this, and the boss can do that, how do I overcome it? The winner, regardless of time, will be chosen.
The only enrage I'd ever want to see on a boss, is something like as health decreases they gain strength or abilities; but then again doing that doesn't really make it an enrage, just a part of who that boss is.
Anyways, Grats again to OP