Aye, it does kind of contradict itself a bit:
Page 24 wrote:Only when a Blood Angel has proven his worth in the Assault and Devastator Squads will he earn his place amongst the Chapter's Tactical Marines.
Page 26 wrote:In other Chapters, the Devastator squad is traditionally the first progression a Space Marine will make after completing his training in a Scout squad. {Snip} By contrast, the Blood Angels Devastator squads are thick with veteran Battle-Brothers, warriors who can be counted upon to hold the impetuous and reckless side of their nature in check...