You are of course assuming that the coins are missing, even though there has been no proof of that.
Ukyo either stole or lost the coins. In both cases you are fucked. If he stole them, the only way to get them back was probably to bring in law enforcement months ago. if he lost them, he's incompetent, so why do you think he'll be able to get them back or do a "project" to earn that many coins again?
Sure there is no proof ukyo says the truth.
If ukyo stole the coins im very convinced he could have come up with some explaination of being hacked by an unknown party. It would be pretty easy to wash those coins in a couple of hours and you would never be able to proof that he was the thieve. If he stole them and it would be possible to find the traces he would have done it pretty dumb.
He had ukyo loan and i believe these loans were for projects too. You know the amount of these loans. So if those projects arent able to earn back the coins then the loan would be a failure from the start too.
There are other scenarios thinkable so that lost coins arent lost in any case and scenarios where he couldnt do anything against.
In any case. It doesnt matter what iam or you think. There is no choice. Will you sue him just for the thin believe that he might have stolen the coins and you will be able to find them? Or sue him now when he says there is still a chance to get even the original coins back but sueing could kill this chance?
Waiting is the only choice that has a slight chance of getting coins back successfully. So there is no much choice at the moment. All the anger doesnt matter. Im not happy with this situation myself but i want to go the route i see the biggest chances for the moment.
Is this still a thing? Haven't people accepted by now that Ukyo most probably is living the life on Cyprus together with Mr. Brewster and a cocktail in his hand?
You know... normal scammers vanish at some point. Ukyo is still available and speaking if you want. Check out IRC.