Reference database, I don't think I need this.
-superboyac
Nice to have you back

What you say makes sense, and it's all about what makes sense for you, but I'd query this.
The reference database isn't a set of unlinked reference sources - the notes in the zettelkasten should take you to, or include directly, the precise part of the reference material that is relevant. And the process of searching references should lead to more thoughts that go in the mix. If a worthwhile thought is made, it should be noted. The references themselves aren't really part of the zettelkasten, but there is a set of fixed relationships with it, rather like a label sewn into an item of clothing.
Now, I'm not advocating you do this, but it is the zettelkasten system.
I'm still faffing around with techniques and programs, so I'm still nowhere really, although I feel subjectively that I have got a long way.