Don't know what you are basing that off but there are a ton of guilds with less time between Blackthorn and Spine than Dream Paragon...
Dream Paragon took 14 days where Kr took 7 for example (see below).
Dream Paragon
H: Warmaster Blackhorn Dec 8, 2011 18:42
H: Spine of Deathwing Dec 22, 2011 17:05
즐거운공격대
H: Warmaster Blackhorn Dec 10, 2011 11:46
H: Spine of Deathwing Dec 17, 2011 16:07
Stars
H: Warmaster Blackhorn Dec 12, 2011 14:40
H: Spine of Deathwing Dec 20, 2011 20:42
In extremis
H: Warmaster Blackhorn Dec 9, 2011 13:28
H: Spine of Deathwing Dec 19, 2011 10:19
Etc...