What Ed could do is message Stunna (https://bitcointalk.org/index.php?action=profile;u=81292) or some other stake rep here and explain him the situation . With the wallet address he can identify the owner of the stake account and just maybe get him some consequences
Hey, I just sent a personal message to stunna regarding the situation as suggested by you. Although, I am least hopeful but its worth a try. Thanks again mate. I see you and @shasan are very helpful since the beginning 
There's no way for any centralized company will reveal their customer's identity if the one who ask it has zero reputation. Considering if Yolo89 was telling his username account in Stake, no proof if Yolo89 is actually own that's account. Someone can just create alt account and claiming if he own x account in Stake. Also this case doesn't have any financial lose or gain for Stake, they wouldn't give any shit about it.
Atleast they can ban his account if he has hacked someone else's stake id.Btw, Im quoting a bet id post made by him, dunno if this could be of any help but still...
Bet ID sport:61476064