Authorities needs to build cases? Cases they do not need to be built: they exist or they do not exist.
Why are you trying to justify authorities having nothing in their hands?!?
The case exists, but it is shredded into thousands of little pieces spread across endless emails, forum posts, phone calls, blockchains, bank transfers, etc, etc. This all needs to be put together in a coherent story to show to a jury before any charges are filed. That takes a long time.
Look how long it took for authorities to piece together a case for Mark Karpeles. It could be years before charges are filed against Garza or anyone else involved.
Unfortunately, we don't have videotaped evidence of Josh rubbing his hands together and laying out piece by piece every step of his master plan like a Scooby Doo villain. Not that he ever had a master plan from the get go, he isn't smart enough to think things though. He just cobbled shit together as he went along.
"Oh, we can't legally or technically prevent other exchanges from trading XPY? I'll be damned. Maybe I should actually read into how this crypto-currency thing works before getting too deep into this business. Some day I surely will. For now, I need to rally my cult into supporting the 20$ floor for me because the CAF was a lie and I am such a raging narcissist that I am sure they will believe me!"
Pretty much every major decision he made regarding XPY was just this deep.
No reason to spook him, let him think he is laying low in Pattaya Texas!