Can him AND Stompy be up at the same time?
I'd think they would be, they're not linked to each other.
This guy has given me the most trouble to find so far. Where dose his path begin? Under the Yaungol advance or Under Temple of the White tiger?
That's incredibly hard to say without seeing him spawn, they walk back and forth until they get tamed or killed. His tracks are tiny and one thing you could do is just go for a look occasionally... he doesn't tend to get picked up much so he should be about. Just follow his approximative path and focus your eye on tiny green tracks... and bring patience :) Good luck!