The correct number is 11, I think this was a mistake in the walkthrough. As to the missing quests, I hope I have described them all in more or less detail in the walkthrough that is linked in the original post.
In general, I designed the game in a way that there are no missed scenes. You can always progress to the point for each character where you can unlock each scene.
As to the training support. I think there is a bug in the bridge favor screen of V and she will not talk to you about Tris. Fixed that In version 2.0.