Now, the credits can be deleted?

No, they can't. Text pages are fine if they're part of a series.

Whoever flagged these just doesn't understand that.

Actually, no. All individual pages must meet danbooru's quality standards. Danbooru doesn't value "completion".

Last I knew, credit pages were the exception to that rule.

I seem to recall the topic being brought up for other pools' text pages before, and the decision being made to keep them?

Damned if I know when that was, though... time to do some digging.

S1eth said:
Actually, no. All individual pages must meet danbooru's quality standards. Danbooru doesn't value "completion".

I understand that. But credits are important specially to show the autor and the ways to contact her/him/ or even them.

I include the importance of the "original idea" from the artist, because in a way, is a form that he could be knowed.

That's what the tags and artist entries are for...

S1eth said:
That's what the tags and artist entries are for...

I guess, I'll be uploading only foreword,afterword and credit page only if the page has above average art(does not include draft sketches) in them how's that?

is that acceptable enough?

S1eth said:
Actually, no. All individual pages must meet danbooru's quality standards. Danbooru doesn't value "completion".

Contrary to your point, text-only pages are acceptable if they're part of the pool.
Credits to http://danbooru.donmai.us/user/show/1309 for clarification.

Good enough for me. I've just done this and the cast page, so that should wrap up the pool.