Easily disprovable.
Just now at level 79:
- Received 75 Rep (Estimated, from 162 XP after 2x rested bonus + 15% warband bonus)
- Total XP to level: 445000
This puts a mob at about 0.02% of a level
https://www.youtube.com/watch?v=ZP2tYjEQJXg
In this video from Dragonflight the player sees:
- 808 XP from mobs (estimated from about 2m video point)
- 234805 Total XP to level
This puts a mob at about 0.34% of a level.
So with DF at 0.34% of a level and TWW at 0.02% of a level that means DF is over 20x higher per mob, relatively.