~snip~
You forgot about the Fortune Jack campaign. However, the participants are paid via their Fortune Jack account. Each participant gets .02 BTC per week. Hhampuz probably gets more than that...
I accounted for his FJ signature:
He may earn an additional 0.08 per month wearing his paid signature,
I am not sure why you believe he is getting paid more than 0.02/week. The majority of his posts are one liners that don't have any real insight, nor is any real effort put into his posts. I don't see why any reasonable person would even accept him into a signature campaign that isn't accepting anyone with a pulse.
The loan does give a motive for Hhampuz to steal from BestMixer, however proving the existence of the loan or that hhampuz would not otherwise be able to repay the loan is not necessary to prove that money was stolen from BestMixer. There remains blockchain evidence that Hhampuz stole money from the BestMixer signature campaign and moved it to chipmixer to hide where it went next.