I don't think I get about this part too. I can't find Stake explaining this on AG, so I am not sure where does OP get this explanation from. Far as I know, casino will require the KYC process to be completed first before they conduct the investigation of the account, which is where OP's current situation [and where he's stuck] right now. Only after the account being verified will an investigation, findings, and ruling be made.
OP, can you perhaps explain more about this?
I hope you're wrong because it would mean they will lock his $45k+ during several more months at least... but if you are right, I don't understand why they didn't say it since the very first day. It would have taken one sentence to say, the event X you've bet on is under investigation, and we need all those documents from yourself in order to conduct our investigation and to make one decision about your case. But since 2 months they've just said privately they're suspending his account "until the completion of [an] investigation" about "an event [he] wagered on" and on Askgamblers, they don't talk about any investigation and pretend to just being a matter of bad KYC. Their communication is very confusing and shady, very unprofessional at least for such amount of money.