Spot the Difference

You can skip straight to step 5 of you like, all previous points to talk to NPCs are optional (thanks to Iceman3317)

1. 
   
2. Optional: Talk to both [npc=226796] and ask what they did today /way #71 60.97 50.68 1.Optional: Talk to both Atheltons
3. 
   
4. Optional: Ask [npc=227731] about Athelton /way #71 63.4 51.6 2. Optional: Talk to Addie Fizzlebog
5. 
   
6. Optional: Ask [npc=82735] about Athelton /way #71 63.34 52.25 3. Optional: Talk to Leeroy Jenkins
7. 
   
8. Optional: Ask [npc=228250] about Athelton /way #71 62.50 51.88 4. Optional: Talk to Hemet Nesingwary Sr.
9. 
   
10. Accuse one [npc=226796] of being the shape shifter, it doesn't matter which one. Correct one is the one standing further away from the carriage.
11. 
    
12. Activate [item=207730] and head to /way #71 60.02 62.52 6. Activate Idol and Kill Demon Y'lliya Xennin
13. 
    
14. Return quest at [npc=226683] at /way #71 63.0 50.2 7. Return Quest at Alyx
15. 
    


/way #71 60.97 50.68 1. Optional: Talk to both Atheltons
/way #71 63.4 51.6 2. Optional: Talk to Addie Fizzlebog
/way #71 63.34 52.25 3. Optional: Talk to Leeroy Jenkins
/way #71 62.50 51.88 4. Optional: Talk to Hemet Nesingwary Sr.
/way #71 60.97 50.68 5. Accuse one Athelton of being the shape shifter
/way #71 60.02 62.52 6. Kill Demon Y'lliya Xennin
/way #71 63.0 50.2 7. Return Quest at Alyx

Thanks kartikeya for confirming step 5 :)
Thanks to Iceman3317 who discovered that steps 1-4 are optional :-)

I stupid idol thing kept getting stuck in a loop on the foot prints and would help me find the next set,

if you got the same its
/way #71 60.02 62.52

Sorry, but walking all over Tanaris looking for footprints in the endless sands with little to no direction cues is NOT a fun time. Who the hell thinks these things up? I'm all for sleuthing, but this is ridiculous.