User blog comment:Dark Seer/Building a Connection./@comment-1932673-20101002170917/@comment-1932673-20101003093150

Inquistors don't have authority over the Space Marines, if you read the GK omnibus you will learn that they are partners with the Inquistion, the Chapter's Masters give certain authorities to the Ordos over some Grey Knights, which can be retracted at any time. Further more Chapters such as the Ultramarines and Space Wolves also show independence of the inqusition if actually bother to read their omnibuses.