Not long after I saw Brother Zephyl on track and tracked him to (right where it says Brother Zephyl on Good's maps) so I decided to do a little information gathering. I followed him south from there until 1046 -2397 where he turned right (as he was going south) and he went west towards the 2 named beetles, then turned north (did not turn west into the drake area) and kept going north and then northwest at 3556, 337, going between the huts, and paused at 4527, 1550 (Hasten paused at 4692 1618) for about 30 seconds. He then proceeded to backtrack to the intersection at 1160, -150 at which point he turned south, went to 312, 25 (Hasten paused at 874, 154 where he turned back east, north at 1078, -2398, paused at 1593, -2434 (right where it says Maldyn the Unkempt on Good's maps) where I witnessed him despawn)) , paused for 30 seconds and then continued south and east to go through the basilisk area.
He then turned north at the intersection at 1006 -2309, until he turned right at 2568 -2285 , heading toward the dead end in the far NE of the zone. He paused at 2992, -3382 for about 30 seconds, and then vanished (I witnessed it).
I watched many of the mobs which follow the similar route path north into the hill giant area and they each to have their own unique path once they get into that area, but it is quite a few different waypoints and too onerous to list them all.
I didn't observe any taking the right turn as Zephyl did, but it seemed they all used the waypoint of 2229 -2312, no matter which way they were going, within that intersection.
Hasten also did show on track without me killing anything, coming out of the hill giant area.
Of note: no PH wandered NE into the dead end tunnel where Zephyl de-spawned.
One PH went south and through the basilisk area, and the one I observed was a lizardman. Interestingly though, this NPC pathed into the drake area after coming south from the unkempt druid area, and did not pause at the same spots Zephyl did.
The same was relevant to Hasten, and his PH. The PH does not follow the same path as the named apparently.