Hey team! One proviso before I ask my question: I don't own either the Ultramarines or White Scars supplements, I'm asking for future supplement releases.
Does the wording of the supplements' Doctrines+1 allow for Successors of those Chapters to use the Doctrines+1?
If yes, is it limited to Inheritors of the Primarch? Or are the Successors allowed to pick their two Chapter Tactics from pages 176 and 177 of the Codex? What are the restrictions around use of Warlords Traits, Relics and Stratagems (named Characters obviously are limited to the actual <CHAPTER>)?