First you don't seem to know how the HG trick works. Since it's no big deal and I'm willing to share it's pretty simple. The MT pops HG when he is very low on HP(<2k, but the lower the better). The Healer doesn't top him off while HG is active, he keeps him at low HP, cause the game doesn't recognize him being invincible at that moment, the game counts every single hit that "would have killed" him towards the LB and increases it by a lot over the course of those 10 seconds. Nobody needs to stop DPSing, nobody has to hold back thus making the whole fight shorter. Just before HG would be off, the WHM tops him off real quick and everything goes on as usual.

The reason the OT isn't doing it (at least for our group) is cause we use the HG trick on him again while he is tanking Asclepius with stacks to build extra LB for Twintania later. Though we decide that on the fly, cause sometimes it's hard t time it right and at that point in the fight you don't wanna risk an unneccesarry wipe due to HG going off too late and the OT dieing. We let the OT tank the big snake, cause he will have all his CDs ready to make it easier on the healers.
If Hg would be ready again for the OT by the time the big snake is being fought, we would let the OT use HG on the adds at the beginning as well, but it's not so we safe it for that.

PS: I never said I refuse to use Gryphonskin accessories. I have them and they are melded cause I'm a min/maxer I was just stating in the other topic that those alone shouldn't make it a guarantee for the OT to have to hold back on Twintania at some point cause he would rip off hate from the MT.

At this point I think we should just drop the topic overall. We are bashing back and forth and this is not gonna lead to anything anyway. Unneccesarry tension and I think we can both agree that everyone has their fair PoV on things.