Participant(e) anonyme You're in China, right? You have been stamped in when entering its territory, right? If THIS stamp is in your previous passport, you should have sent both scans, just to be sure. There's nothing you can do now, you can only wait. Maybe they will be fine with the current passport only, maybe they wanted to see your entry stamp, there is no way to know for sure. That's why uploading both would have made sense (if your CURRENT CHINESE ENTRY STAMP is in your old passport).
Participant(e) anonyme Does it contain your current Chinese entry stamp/visa? If yes, it would have made sense to upload a scan of it. However, you cannot upload anything if there is no request for additional documents. If you've done the upload already, the only thing you can do is wait for them to either issue/deny the visa or request further documents.
A friend of mine has just got his 2 daughters' dependent DTV visas issued (on a Saturday), although he had "only" 750K in the bank. He applied in Europe, and it probably depends a lot on the embassy and the overall "strength" of the profile though (nationality, income, etc.).
I think it's one the most outstanding grey areas in the whole DTV thing. We'll probably never get a definite answer. While I would find it legitimate to ask for 500K for each adult dependent, doing the same for children seems a bit over the top. There are not a lot of people who are OK with letting sit say 2 millions THB in a bank account for 3-6 months. There are much better ways to manage savings.
I think the OP's question is legitimate. Out of the 3 examples you've given, one does not say anything about the bank deposit for dependents. The 2 other applicants got their visa, but they had 500K per applicant, even in the case of children. Whilst it proves that one can be successful if they have 500K per dependent, it does not necessarily mean that 500K per dependent are needed at this embassy.
The professional portfolio is an option, not a strict requirement, to prove one's freelancer status. Many of us have been issued a DTV without showing a portfolio. However, if your professional activity is such that you can provide a portfolio, show them one. If you are a graphic designer, a web designer, a translator, a SEO consultant, etc., providing a portfolio should be easy. In case providing a portfolio is impossible (because what you do can't be shown in a portfolio), then you can write a document in which you explain what you do.
It means what it says, and it could still be denied. Basically, the documents provided are sufficient for them to make a decision, but someone now has to decide whether to issue a visa or not. If I remind correctly, there have been cases where applicants still had to provide further documents after their application had reached this status though.