Regarding Gundrak, can you:

1) Kill Snake Boss
2) Jump in water (possible?) and kill Colossus
3) Run through trash to next area (right) and jump into water (pray they evade)
4) Swim to moorabi, kill, etc..

If they dont evade then I guess you'd have to kill them, but wouldn't that be faster than going out of the instance to get to the Moorabi entrance?