So even in this case, it is true that 101130147 is the darthknight's Binance wallet. And we can also confirm this with darthknight himself sending to deepcrypto8 with the same memo.

Yep, I agree with this. As far as we can tell, it looks like it is.

So for your theoretical case to work, it has to be that darthknight has bought the about 1.5M STEEM using blocktrades throughout about two years...

Yes. He also may have been selling too (on the Binance exchange), so if he is an active trader - that isn't actually that unreasonable.

and suddenly decided to write an introduction post with lies two months ago.

I agree based on what is being presented, that the post saying he is "new" seems untrue. You could stretch the situation into something along the lines of he was purely an investor before, and now he is actually checking out the platform.. But agree that these two things do not 100% line up.

Also, we all know that blocktrades charges high fees

The fees are not actually that high. I use the exchange quite frequently.

an investor who trades more than 1M STEEM would rather send whatever coins directly to Binance to save on fees.

Where would they have bought the STEEM from?

If you really believe that it were the case... well I don't know know what to say.

I really don't know what to believe. The main point is we don't know. The post is asserting things that could be true. They don't know either though.

My thread is intended to point out that there are other possibilities of truth too, so we should be careful not to jump to conclusions when it is impossible to know with 100% certainty what is actually going on.

In any case, I appreciate your input again. I respect your decision regarding 22.2, and I am honored to have a productive conversation with you like this.

Thanks :) Same to you.