Using the same exploit: In Plane of Earth B my guild would skip everything before Rathe Council and in Vex Thal we could run on the roof and get to any of the bosses. Also, I never did it personally but Necros could solo Mithaniel Marr. The exploit allowing all of this was related to Necros+Mount+DMF Clicky item. If you spam-click the DMF item, while on a mount, while auto-running at a wall, you would RISE instead of FALL, you pop through the ceiling of the zone-in to PoEB then float over to the Rathe Council area, use summon corpse on your mage and start CoHing the raid. In Vex thal you do the same thing until the necro is standing on the VT roof, summon mage, (or corpses of your group), and a necro could use it to rise to the ceiling in Mith Marr's room and use pets to slowly kill him.
Also some weird "bugs" later in the game due to Sony's excellent scripting. In the last zone of GoD 1 boss in particular would spawn adds in intervals and the doors to the room would lock and all kinds of bullshit. My guild wiped to the boss but I was able to FD in a corner (I was a monk), I always had a revive staff on me (would sell & re-buy to recharge them), and I got our raid revived back up... thing was, the door was still locked and the boss stopped spawning adds (and the adds despawned) and once our raid was all back up, we were able to kill the boss without it ever fighting back. Seemed cheap-as-fuck but whatever, this was the kinda shit that was memorable to me.
With regard to pulling and aggro ticks: the trick to splitting Rathe council and most other mobs of the sort was that once the rest of the mobs were back in their "home" position, they would no longer respond to the "help" call of the mobs that had not reset yet. Simply pull 1 of the mobs far enough away, let the rest reset, and you can solo pull very easily. I was a Monk and the raid leader for my guild and I pulled everything in the game up to GoD. Rathe was a very simple encounter to pull and could be done easily with 1 monk.