Your evidence shown for the amount are assumptions and you admit this, but haijins comment above calls them gifts. Gifts are not to be returned and not returning them is not theft.
This whole issue is very unprofessional, which is how haijin is, so the blame lies on his lap in my book.
DStors needs to continue and Haijin needs to come up with his own idea, rather than stealing another's. Haijin is the thief here and hurtful to the Steemit Platform.